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Acanthosis nigricans

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348: 241: 232: 223: 214: 205: 329: 40: 367:. Higher than normal insulin levels in the blood stream cause the growth of darkened skin over certain areas of the body. No skin treatment will cure it, but acanthosis nigricans may lighten up and possibly disappear by treating the root cause, insulin resistance, but it can take months or years to do so. Insulin resistance syndromes may be divided into type A (HAIR-AN) and type B syndromes. 600:
Acanthosis nigricans is likely to improve in circumstances where a known cause is removed. For example, obesity-related acanthosis nigricans will improve with weight loss, and drug-induced acanthosis nigricans is likely to resolve when the drug is ceased. Hereditary variants may or may not fade with
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topical 2 percent applied in thin layer to dry skin ten minutes prior to bathing may clear symptoms. Selenium sulfide applied to dry scalp or skin is an inexpensive well tolerated treatment to balance skin's biome and works by drying fungus like tinea versicolor that can coexist with acanthosis and
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This form of acanthosis nigricans is more likely to involve mucous membranes (25–50% of cases) Malignant acanthosis nigricans that may either precede (18%), accompany (60%), or follow (22%) the onset of an internal cancer. Malignancy-associated acanthosis nigricans is usually rapid in onset and may
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The majority of cases of acanthosis nigricans are associated with obesity and otherwise idiopathic. This is likely because of insulin resistance and more likely to occur in darker-skinned persons. This can also be referred to as pseudoacanthosis nigricans. In some cases, AN attributable to obesity
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Acral acanthotic anomaly refers to a variant of acanthosis nigricans limited to the elbows, knees, knuckles, and dorsal surfaces of the feet, in the absence of any other findings, in otherwise healthy individuals. While the etiology remains unknown, its presence does not suggest a likelihood of
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An alternate classification system still used to describe acanthosis nigricans was proposed in 1994. It delineates acanthosis nigricans syndromes according to their associated syndromes, including benign and malignant forms, forms associated with obesity and drugs, acral acanthosis nigricans,
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and insulin resistance will occur on ones face. Most typically it will be present as a horizontal band on the forehead, but may also appear as perioral hyperpigmentation, periorbital hyperpigmentation, or generalized facial skin darkening.
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In conjunction with increased end levels of IGF, it is likely that perspiration and friction may be necessary predeterminants for lesions, since the level of insulin is usually not enough to activate IGF receptors across the body.
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Acanthosis nigricans is typically diagnosed clinically. A skin biopsy may be needed in unusual cases. If no clear cause is obvious, it may be necessary to search for one. Blood tests, an
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cancers such as those of the prostate, breast, and ovary. Other cancers, such as those of the lung, stomach, and lymphoma, are occasionally associated with acanthosis nigricans.
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levels through exercise and diet often improves symptoms. Topical fade creams (normally used for eliminating age spots) can lighten skin cosmetically in less severe cases.
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brown-black, poorly defined, velvety patches of skin, typically affecting the face, neck, underarms, genitals, groin, elbows, knees, anus, umbilicus and nasal crease.
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Acanthosis nigricans associated with endocrine dysfunction is more insidious in its onset, is less widespread, and the patients are often concurrently obese.
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Acanthosis nigricans is conventionally divided into benign and malignant forms, although may be divided into syndromes according to cause:
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associated with a cancer. Malignant acanthosis nigricans is most commonly associated with gastrointestinal adenocarcinomas, as well as
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Higgins, SP; Freemark, M; Prose, NS (Sep 15, 2008). "Acanthosis nigricans: a practical approach to evaluation and management".
3239: 2176: 1825: 509:(TGF), which appears to be the mechanism for malignancy-associated acanthosis nigricans. TGF acts on epidermal tissue via the 2723: 2718: 2538: 2087: 1906: 1772: 3376: 3071: 2941: 2926: 2743: 2619: 2276: 2235: 2181: 3330: 2918: 2738: 2486: 2143: 3061: 2902: 2765: 2664: 2533: 2528: 2510: 2230: 2250: 1916: 1263:
Tilgen W (2009). "Benign epidermal tumors". In WHC Burgdorf; G Plewig; HH Wolff; M Landthaler; O Braun-Falco (eds.).
310:, pineal hyperplasia syndrome, pituitary basophilism, ovarian hyperthecosis, stromal luteoma, ovarian dermoid cysts, 2481: 749: 592:
exacerbate discoloration. Acanthosis nigricans maligna may resolve if the causative tumor is successfully removed.
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On biopsy, hyperkeratosis, epidermal folding, leukocyte infiltration, and melanocyte proliferation may be seen.
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People with acanthosis nigricans should be screened for diabetes and, although rare, cancer. Controlling
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Endocrine syndromes associated with acanthosis nigricans can develop in many conditions, particularly:
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Verma, Shyam; Vasani, Resham; Joshi, Rajiv; Phiske, Meghana; Punjabi, Pritesh; Toprani, Tushar (2016).
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James, William D.; Elston, Dirk; Treat, James R.; Rosenbach, Misha A.; Neuhaus, Isaac (2020).
473: 465: 339: 262: 151: 115: 111: 72: 55: 3221: 3148: 3029: 2999: 2812: 2644: 2055: 1618: 1376: 1337: 1232: 1195: 1154: 1115: 1055: 1018: 1000: 930: 699: 610: 588: 560:: This may include obesity-related, hereditary, and endocrine forms of acanthosis nigricans. 17: 3338: 2397: 2117: 2075: 2060: 2030: 2004: 1901: 1747: 1085: 167: 3229: 2634: 2568: 2416: 2409: 2387: 2309: 1875: 1815: 1705: 1059: 1023: 988: 966: 483:
Increased circulating insulin. This activates keratinocyte IGF receptors, particularly
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age, and malignancy-associated variants may, after a malignancy is removed, fade.
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In young persons, acanthosis nigricans is a visible marker which strongly suggests
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Malignant acanthosis nigricans refers to acanthosis nigricans occurring as a
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It typically occurs in individuals younger than age 40, is associated with
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is a medical sign characterised by brown-to-black, poorly defined, velvety
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Rigel DS; Jacobs MI (1980). "Malignant acanthosis nigricans:a review".
703: 491:(IGFBP). Increased circulating IGF may lead to keratinocyte and dermal 453: 1452: 3163: 2876: 2832: 2672: 2584: 2404: 1464: 917:
Tamega A, Aranha AM, Guiotoku MM, Miot LD, Miot HA (1 January 2010).
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Factors involved in the development of acanthosis nigricans include:
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Garofalo, L.; A.M. Biscozzi; V. Mastrandrea; E. Bonifazi (2003).
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Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007).
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unilateral acanthosis nigricans, and mixed and syndromic forms.
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Fitzpatrick's color atlas and synopsis of clinical dermatology
1290:"Acanthosis nigricans vulgaris. A marker of hyperinsulinemia" 796:(5th ed.). New York: McGraw-Hill Medical Pub. Division. 1106:
Schnopp C; Baumstark J (2007). "Oral acanthosis nigricans".
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trait, presenting at birth or developing during childhood.
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Acanthosis nigricans is caused by increased activation of
1267:(3rd ed.). Heidelberg: Springer. pp. 1340–7. 1143:"Acral acanthosis nigricans (acral acanthotic anomaly)" 823:
James, William; Berger, Timothy; Elston, Dirk (2005).
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The Pigmentary System: Physiology and Pathophysiology
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Cutaneous keratosis, ulcer, atrophy, and necrobiosis
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Schwartz, Robert A. (1994). "Acanthosis nigricans".
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Palisaded neutrophilic and granulomatous dermatitis
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Andrews' Diseases of the Skin: Clinical Dermatology
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Andrews' Diseases of the Skin: Clinical Dermatology
379:Acanthosis nigricans has been linked to the use of 54: 32: 2932:Lupus erythematosus–lichen planus overlap syndrome 2051:Inherited patterned lentiginosis in black persons 1223:Schwartz RA (July 1994). "Acanthosis nigricans". 787: 785: 783: 781: 779: 777: 775: 773: 771: 769: 359:Type III – obesity and pseudoacanthosis nigricans 130:and other cells in the skin. Activation of other 2260:Eczematid-like purpura of Doucas and Kapetanakis 1258: 1256: 1254: 1048:The Journal of Dermatologic Surgery and Oncology 534:may be required to eliminate the possibility of 194:Familial acanthosis may arise as a result of an 2980:Morphea–lichen sclerosus et atrophicus overlap 1330:Journal of the American Academy of Dermatology 845: 843: 841: 3198: 2443: 1912:Yemenite deaf-blind hypopigmentation syndrome 1591: 819: 817: 815: 813: 685: 683: 681: 679: 677: 643:(13th ed.). Elsevier. pp. 502–504. 630: 628: 626: 498:In hereditary forms of acanthosis nigricans, 8: 726:"Acanthosis nigricans - Symptoms and causes" 338:, an indicator for elevated blood sugar and 1980:Reticular pigmented anomaly of the flexures 887: 885: 883: 881: 879: 877: 875: 873: 871: 792:Thomas B. Fitzpatrick; et al. (2005). 3358: 3205: 3191: 3183: 2887: 2701: 2450: 2436: 2428: 2215: 1954: 1935: 1730: 1639: 1628: 1598: 1584: 1576: 1443: 489:insulin-like growth factor-binding protein 38: 29: 2544:Seborrheic keratosis with squamous atypia 1380: 1365:"Acanthosis nigricans: study of 90 cases" 1199: 1158: 1079: 1077: 1022: 1004: 934: 2785:Interstitial granulomatous drug reaction 2756:Annular elastolytic giant-cell granuloma 2578:Confluent and reticulated papillomatosis 2561:Keratosis punctata of the palmar creases 2256:Doucas and Kapetanakis pigmented purpura 1985:Naegeli–Franceschetti–Jadassohn syndrome 2630:Multiple minute digitate hyperkeratosis 2615:Hyperkeratosis of the nipple and areola 1995:X-linked reticulate pigmentary disorder 1975:Reticulate acropigmentation of Kitamura 1970:Pigmentatio reticularis faciei et colli 1414:"50. Acquired epidermal hypermelanoses" 622: 334:A. nigricans, right armpit; notice the 324: 200: 170:, obesity or endocrinopathies, such as 3481:Endocrine-related cutaneous conditions 3405:Acrokeratosis paraneoplastica of Bazex 3286:Paraneoplastic cerebellar degeneration 2487:Acrokeratosis paraneoplastica of Bazex 2367:Dyschromatosis universalis hereditaria 2172:Familial progressive hyperpigmentation 1412:Levine, Norman; Burk, Cynthia (2008). 3491:Medical conditions related to obesity 3077:Atrophia maculosa varioliformis cutis 2781:Interstitial granulomatous dermatitis 2362:Dyschromatosis symmetrica hereditaria 2197:Transient neonatal pustular melanosis 7: 3268:Nonbacterial thrombotic endocarditis 2605:Hyperkeratosis lenticularis perstans 2187:Photoleukomelanodermatitis of Kobori 1965:Dermatopathia pigmentosa reticularis 186:, and may be genetically inherited. 120:insulin-like growth factor receptors 3057:Acrodermatitis chronica atrophicans 3263:Multicentric reticulohistiocytosis 3159:Poikiloderma vasculare atrophicans 3052:Atrophoderma of Pasini and Pierini 2990:Atrophoderma of Pasini and Pierini 2192:Postinflammatory hyperpigmentation 2112:Poikiloderma vasculare atrophicans 1060:10.1111/j.1524-4725.1980.tb01003.x 896:(5th ed.). Edinburgh: Mosby. 136:fibroblast growth factor receptors 122:, which leads to proliferation of 25: 3316:Lambert–Eaton myasthenic syndrome 3100:Reactive perforating collagenosis 2734:Granuloma annulare in HIV disease 1897:Postinflammatory hypopigmentation 1841:Progressive macular hypomelanosis 993:Indian Dermatology Online Journal 923:Anais Brasileiros de Dermatologia 500:fibroblast growth factor receptor 389:combined oral contraceptive pills 2549:Reticulated seborrheic keratosis 1831:Idiopathic guttate hypomelanosis 1382:10.1097/00005792-196801000-00002 1184:"Acral acanthotic anomaly (AAA)" 511:epidermal growth factor receptor 346: 327: 239: 230: 221: 212: 203: 150:Acanthosis nigricans appears as 140:epidermal growth factor receptor 3446:Febrile neutrophilic dermatosis 3415:Florid cutaneous papillomatosis 3321:Anti-NMDA receptor encephalitis 3115:Acquired perforating dermatosis 3105:Elastosis perforans serpiginosa 3045:Jadassohn–Pellizzari anetoderma 2315:Titanium metallic discoloration 2071:Partial unilateral lentiginosis 1363:Brown J; Winkelmann RK (1968). 936:10.1590/S0365-05962010000100003 750:"What Is Acanthosis Nigricans?" 2539:Irritated seborrheic keratosis 2088:Erythema dyschromicum perstans 1182:Schwartz RA (September 1981). 1: 3377:Necrolytic migratory erythema 3072:Linear atrophoderma of Moulin 2744:Patch-type granuloma annulare 2620:Inverted follicular keratosis 2277:Hemosiderin hyperpigmentation 2236:Pigmented purpuric dermatosis 2182:Periorbital hyperpigmentation 1678:Vogt–Koyanagi–Harada syndrome 1342:10.1016/S0190-9622(94)70128-8 1237:10.1016/S0190-9622(94)70128-8 1201:10.1016/S0190-9622(81)80155-7 1141:Schwartz RA (February 2007). 3410:Extramammary Paget's disease 3040:Schweninger–Buzzi anetoderma 2739:Localized granuloma annulare 2144:Shiitake mushroom dermatitis 965:. 2018-04-12. Archived from 669:Dorland's Medical Dictionary 18:Acanthosis nigricans type II 2766:Necrobiotic xanthogranuloma 2665:Waxy keratosis of childhood 2534:Common seborrheic keratosis 2529:Clonal seborrheic keratosis 2511:Keratoderma blennorrhagicum 2231:Iron metallic discoloration 1907:Vagabond's leukomelanoderma 3507: 3240:Zollinger–Ellison syndrome 2482:Paraneoplastic keratoderma 2177:Pallister–Killian syndrome 1826:Albinism–deafness syndrome 1160:10.1016/j.jaad.2006.09.027 692:Dermatology Online Journal 507:transforming growth factor 2554:Dermatosis papulosa nigra 2477:Keratoderma climactericum 2093:Lichen planus pigmentosus 2041:Centrofacial lentiginosis 1798:Griscelli syndrome type 3 1793:Griscelli syndrome type 2 1773:Hermansky–Pudlak syndrome 1265:Braun-Falco's Dermatology 892:Habif, Thomas P. (2009). 852:Dermatology: 2-Volume Set 609:AN was first reported by 448:proteins, usually due to 298:Rare diseases, including 285:polycystic ovary syndrome 180:polycystic ovary syndrome 142:can also be responsible. 46: 37: 3456:Paraneoplastic pemphigus 3214:Paraneoplastic syndromes 3110:Perforating folliculitis 3062:Semicircular lipoatrophy 2499:Drug-induced keratoderma 2046:Generalized lentiginosis 1778:ChĂ©diak–Higashi syndrome 1297:Eur. J. Pediat. Dermatol 1006:10.4103/2229-5178.193898 963:www.nuecesmedsociety.org 827:. (10th ed.). Saunders. 637:"24. Endocrine diseases" 456:-mediated activation of 452:. This is most commonly 431:Acral acanthotic anomaly 47:Acanthosis nigricans on 3372:Erythema gyratum repens 3344:Hypertrophic osteopathy 3067:Follicular atrophoderma 2855:eosinophilic dermatosis 2107:Poikiloderma of Civatte 1743:Oculocutaneous albinism 405:paraneoplastic syndrome 132:growth factor receptors 2795:Foreign body granuloma 2706:Necrobiotic/palisading 2600:Chronic scar keratosis 2251:Gougerot–Blum syndrome 2134:Incontinentia pigmenti 1990:Dyskeratosis congenita 1917:Wende–Bauckus syndrome 1836:Phylloid hypomelanosis 1607:Pigmentation disorders 1303:: 85–8. Archived from 1231:(1): 1–19, quiz 20–2. 1086:"Acanthosis nigricans" 664:"acanthosis nigricans" 568:tumour necrosis factor 446:growth factor receptor 375:Type IV – drug-related 353:A. nigricans, axillary 102:It is associated with 2970:Localized scleroderma 2751:Necrobiosis lipoidica 2683:Cutis verticis gyrata 2610:Hydrocarbon keratosis 2494:Aquagenic keratoderma 1673:Alezzandrini syndrome 1652:Quadrichrome vitiligo 1225:J. Am. Acad. Dermatol 1188:J. Am. Acad. Dermatol 1147:J. Am. Acad. Dermatol 1120:10.1056/NEJMicm062917 450:endocrine dysfunction 312:Prader-Willi syndrome 308:lipoatrophic diabetes 118:. This activates the 104:endocrine dysfunction 3451:Pyoderma gangrenosum 3400:Ichthyosis acquisita 3395:Acanthosis nigricans 3133:Pyoderma gangrenosum 2995:Pansclerotic morphea 2776:Rheumatoid nodulosis 2761:Granuloma multiforme 2640:Reactional keratosis 2590:Ichthyosis acquisita 2573:Acanthosis nigricans 2524:Seborrheic keratosis 2465:Epidermal thickening 2270:Angioma serpiginosum 2162:Acanthosis nigricans 1701:Waardenburg syndrome 894:Clinical dermatology 854:. St. Louis: Mosby. 421:seborrheic keratoses 69:Acanthosis nigricans 33:Acanthosis nigricans 3311:Transverse myelitis 3296:Limbic encephalitis 2985:Generalized morphea 2823:Zirconium granuloma 2803:Beryllium granuloma 2671:other hypertrophy: 2625:Lichenoid keratosis 2595:Arsenical keratosis 2000:Galli–Galli disease 1892:Nevus depigmentosus 399:Type V – malignancy 271:excess circulating 249:Type II – endocrine 3425:Pityriasis rotunda 3245:Cushing's syndrome 3005:Linear scleroderma 2818:Silicone granuloma 2714:Granuloma annulare 2246:Majocchi's disease 2139:Scratch dermatitis 2066:Mucosal lentigines 1866:Vasospastic macule 1783:Griscelli syndrome 1539:External resources 704:10.5070/D37MF6G290 470:insulin resistance 415:be accompanied by 365:insulin resistance 267:metabolic syndrome 259:insulin resistance 196:autosomal dominant 164:insulin resistance 146:Signs and symptoms 108:insulin resistance 3468: 3467: 3464: 3463: 3420:Leser-TrĂ©lat sign 3291:Encephalomyelitis 3180: 3179: 3176: 3175: 2975:Localized morphea 2947:Rowell's syndrome 2871: 2870: 2861:Granuloma faciale 2808:Mercury granuloma 2678:Hypertrophic scar 2660:Warty dyskeratoma 2650:Thermal keratosis 2425: 2424: 2348: 2347: 2344: 2343: 2305:Arsenic poisoning 2241:Schamberg disease 2205: 2204: 2098:CafĂ© au lait spot 1925: 1924: 1849: 1848: 1788:Elejalde syndrome 1714: 1713: 1573: 1572: 1427:978-1-4051-2034-0 1274:978-3-540-29312-5 903:978-0-7234-3541-9 861:978-1-4160-2999-1 803:978-0-07-144019-6 650:978-0-323-54753-6 474:diabetes mellitus 466:hyperinsulinaemia 464:, as a result of 340:hyperinsulinaemia 290:Addison's disease 277:Cushing's disease 263:diabetes mellitus 190:Type I – familial 184:Cushing's disease 116:diabetes mellitus 112:hyperinsulinaemia 99:and other areas. 73:hyperpigmentation 66: 65: 27:Medical condition 16:(Redirected from 3498: 3359: 3207: 3200: 3193: 3184: 3149:Calcinosis cutis 3030:Lichen sclerosus 3000:Morphea profunda 2888: 2813:Silica granuloma 2702: 2645:Stucco keratosis 2452: 2445: 2438: 2429: 2216: 2056:Ink spot lentigo 1955: 1936: 1731: 1657:Vitiligo ponctuĂ© 1640: 1629: 1600: 1593: 1586: 1577: 1444: 1432: 1431: 1409: 1403: 1402: 1384: 1360: 1354: 1353: 1325: 1319: 1318: 1316: 1315: 1309: 1294: 1285: 1279: 1278: 1260: 1249: 1248: 1220: 1214: 1213: 1203: 1179: 1173: 1172: 1162: 1138: 1132: 1131: 1103: 1097: 1096: 1094: 1092: 1081: 1072: 1071: 1043: 1037: 1036: 1026: 1008: 984: 978: 977: 975: 974: 955: 949: 948: 938: 914: 908: 907: 889: 866: 865: 847: 836: 821: 808: 807: 789: 764: 763: 761: 760: 746: 740: 739: 737: 736: 722: 716: 715: 687: 672: 661: 655: 654: 632: 589:Selenium sulfide 350: 331: 316:Alström syndrome 243: 234: 225: 216: 207: 42: 30: 21: 3506: 3505: 3501: 3500: 3499: 3497: 3496: 3495: 3471: 3470: 3469: 3460: 3434: 3381: 3348: 3339:Dermatomyositis 3331:Musculoskeletal 3325: 3272: 3249: 3216: 3211: 3181: 3172: 3137: 3119: 3081: 3020: 3011: 2960: 2951: 2893: 2892:Cutaneous lupus 2880: 2867: 2847:Other/ungrouped 2842: 2789: 2687: 2655:Viral keratosis 2459: 2456: 2426: 2421: 2371: 2340: 2319: 2287: 2281: 2226:Hemochromatosis 2211: 2201: 2154: 2148: 2122: 2118:Riehl melanosis 2076:PUVA lentigines 2061:Lentigo maligna 2031:Lentigo simplex 2015: 2009: 2005:Revesz syndrome 1948: 1943: 1921: 1902:Pityriasis alba 1880: 1871:Woronoff's ring 1858: 1845: 1804: 1765: 1757: 1748:Ocular albinism 1724: 1710: 1688: 1682: 1661: 1633: 1622: 1613: 1604: 1574: 1569: 1568: 1534: 1533: 1455: 1441: 1436: 1435: 1428: 1411: 1410: 1406: 1362: 1361: 1357: 1327: 1326: 1322: 1313: 1311: 1307: 1292: 1287: 1286: 1282: 1275: 1262: 1261: 1252: 1222: 1221: 1217: 1181: 1180: 1176: 1140: 1139: 1135: 1105: 1104: 1100: 1090: 1088: 1084:Ngan, Vanessa. 1083: 1082: 1075: 1045: 1044: 1040: 986: 985: 981: 972: 970: 957: 956: 952: 916: 915: 911: 904: 891: 890: 869: 862: 849: 848: 839: 822: 811: 804: 791: 790: 767: 758: 756: 748: 747: 743: 734: 732: 724: 723: 719: 689: 688: 675: 662: 658: 651: 634: 633: 624: 619: 607: 598: 581: 551: 524: 442: 440:Pathophysiology 433: 401: 377: 361: 354: 351: 342: 332: 275:, particularly 251: 244: 235: 226: 217: 208: 192: 168:Type 2 diabetes 160: 148: 28: 23: 22: 15: 12: 11: 5: 3504: 3502: 3494: 3493: 3488: 3483: 3473: 3472: 3466: 3465: 3462: 3461: 3459: 3458: 3453: 3448: 3442: 3440: 3436: 3435: 3433: 3432: 3427: 3422: 3417: 3412: 3407: 3402: 3397: 3391: 3389: 3387:Papulosquamous 3383: 3382: 3380: 3379: 3374: 3368: 3366: 3356: 3350: 3349: 3347: 3346: 3341: 3335: 3333: 3327: 3326: 3324: 3323: 3318: 3313: 3308: 3303: 3298: 3293: 3288: 3282: 3280: 3274: 3273: 3271: 3270: 3265: 3259: 3257: 3251: 3250: 3248: 3247: 3242: 3237: 3232: 3230:Hypercalcaemia 3226: 3224: 3218: 3217: 3212: 3210: 3209: 3202: 3195: 3187: 3178: 3177: 3174: 3173: 3171: 3170: 3161: 3156: 3151: 3145: 3143: 3139: 3138: 3136: 3135: 3129: 3127: 3121: 3120: 3118: 3117: 3112: 3107: 3102: 3097: 3091: 3089: 3083: 3082: 3080: 3079: 3074: 3069: 3064: 3059: 3054: 3049: 3048: 3047: 3042: 3032: 3026: 3024: 3013: 3012: 3010: 3009: 3008: 3007: 3002: 2997: 2992: 2987: 2982: 2977: 2966: 2964: 2953: 2952: 2950: 2949: 2944: 2939: 2934: 2929: 2922: 2921: 2911: 2910: 2905: 2898: 2896: 2885: 2873: 2872: 2869: 2868: 2866: 2865: 2864: 2863: 2850: 2848: 2844: 2843: 2841: 2840: 2835: 2830: 2825: 2820: 2815: 2810: 2805: 2799: 2797: 2791: 2790: 2788: 2787: 2778: 2773: 2768: 2763: 2758: 2753: 2748: 2747: 2746: 2741: 2736: 2731: 2726: 2721: 2710: 2708: 2699: 2689: 2688: 2686: 2685: 2680: 2675: 2668: 2667: 2662: 2657: 2652: 2647: 2642: 2637: 2635:PUVA keratosis 2632: 2627: 2622: 2617: 2612: 2607: 2602: 2597: 2592: 2587: 2582: 2581: 2580: 2569:hyperkeratosis 2564: 2563: 2558: 2557: 2556: 2551: 2546: 2541: 2536: 2531: 2516: 2515: 2514: 2513: 2501: 2496: 2491: 2490: 2489: 2479: 2469: 2467: 2461: 2460: 2457: 2455: 2454: 2447: 2440: 2432: 2423: 2422: 2420: 2419: 2417:Depigmentation 2414: 2413: 2412: 2402: 2401: 2400: 2390: 2388:Skin whitening 2385: 2379: 2377: 2373: 2372: 2370: 2369: 2364: 2358: 2356: 2350: 2349: 2346: 2345: 2342: 2341: 2339: 2338: 2333: 2327: 2325: 2321: 2320: 2318: 2317: 2312: 2310:Lead poisoning 2307: 2302: 2297: 2291: 2289: 2283: 2282: 2280: 2279: 2274: 2273: 2272: 2267: 2262: 2253: 2248: 2243: 2233: 2228: 2222: 2220: 2213: 2207: 2206: 2203: 2202: 2200: 2199: 2194: 2189: 2184: 2179: 2174: 2169: 2164: 2158: 2156: 2150: 2149: 2147: 2146: 2141: 2136: 2130: 2128: 2124: 2123: 2121: 2120: 2115: 2109: 2100: 2095: 2090: 2085: 2079: 2078: 2073: 2068: 2063: 2058: 2053: 2048: 2043: 2038: 2033: 2019: 2017: 2011: 2010: 2008: 2007: 2002: 1997: 1992: 1987: 1982: 1977: 1972: 1967: 1961: 1959: 1952: 1933: 1927: 1926: 1923: 1922: 1920: 1919: 1914: 1909: 1904: 1899: 1894: 1888: 1886: 1882: 1881: 1879: 1878: 1876:Nevus anemicus 1873: 1868: 1862: 1860: 1851: 1850: 1847: 1846: 1844: 1843: 1838: 1833: 1828: 1823: 1818: 1816:Cross syndrome 1812: 1810: 1806: 1805: 1803: 1802: 1801: 1800: 1795: 1790: 1780: 1775: 1769: 1767: 1759: 1758: 1756: 1755: 1750: 1745: 1739: 1737: 1728: 1716: 1715: 1712: 1711: 1709: 1708: 1706:Tietz syndrome 1703: 1698: 1692: 1690: 1684: 1683: 1681: 1680: 1675: 1669: 1667: 1663: 1662: 1660: 1659: 1654: 1648: 1646: 1637: 1626: 1615: 1614: 1605: 1603: 1602: 1595: 1588: 1580: 1571: 1570: 1567: 1566: 1555: 1543: 1542: 1540: 1536: 1535: 1532: 1531: 1520: 1509: 1498: 1487: 1472: 1456: 1451: 1450: 1448: 1447:Classification 1440: 1439:External links 1437: 1434: 1433: 1426: 1404: 1355: 1320: 1280: 1273: 1250: 1215: 1174: 1133: 1098: 1073: 1038: 999:(6): 498–503. 979: 950: 909: 902: 867: 860: 837: 809: 802: 765: 741: 717: 673: 656: 649: 621: 620: 618: 615: 606: 603: 597: 594: 580: 577: 572: 571: 561: 550: 549:Classification 547: 542:as the cause. 523: 520: 515: 514: 503: 502:(FGFR) defects 496: 495:proliferation. 441: 438: 432: 429: 400: 397: 393:growth hormone 385:glucocorticoid 381:nicotinic acid 376: 373: 360: 357: 356: 355: 352: 345: 343: 333: 326: 320: 319: 296: 294:hypothyroidism 287: 269: 250: 247: 246: 245: 238: 236: 229: 227: 220: 218: 211: 209: 202: 191: 188: 172:hypothyroidism 159: 156: 147: 144: 64: 63: 58: 52: 51: 44: 43: 35: 34: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 3503: 3492: 3489: 3487: 3486:Medical signs 3484: 3482: 3479: 3478: 3476: 3457: 3454: 3452: 3449: 3447: 3444: 3443: 3441: 3437: 3431: 3428: 3426: 3423: 3421: 3418: 3416: 3413: 3411: 3408: 3406: 3403: 3401: 3398: 3396: 3393: 3392: 3390: 3388: 3384: 3378: 3375: 3373: 3370: 3369: 3367: 3365: 3360: 3357: 3355: 3354:Mucocutaneous 3351: 3345: 3342: 3340: 3337: 3336: 3334: 3332: 3328: 3322: 3319: 3317: 3314: 3312: 3309: 3307: 3304: 3302: 3299: 3297: 3294: 3292: 3289: 3287: 3284: 3283: 3281: 3279: 3275: 3269: 3266: 3264: 3261: 3260: 3258: 3256: 3255:Hematological 3252: 3246: 3243: 3241: 3238: 3236: 3233: 3231: 3228: 3227: 3225: 3223: 3219: 3215: 3208: 3203: 3201: 3196: 3194: 3189: 3188: 3185: 3169: 3168:Pseudo-ainhum 3165: 3162: 3160: 3157: 3155: 3154:Sclerodactyly 3152: 3150: 3147: 3146: 3144: 3140: 3134: 3131: 3130: 3128: 3126: 3122: 3116: 3113: 3111: 3108: 3106: 3103: 3101: 3098: 3096: 3095:Kyrle disease 3093: 3092: 3090: 3088: 3084: 3078: 3075: 3073: 3070: 3068: 3065: 3063: 3060: 3058: 3055: 3053: 3050: 3046: 3043: 3041: 3038: 3037: 3036: 3033: 3031: 3028: 3027: 3025: 3023: 3018: 3014: 3006: 3003: 3001: 2998: 2996: 2993: 2991: 2988: 2986: 2983: 2981: 2978: 2976: 2973: 2972: 2971: 2968: 2967: 2965: 2963: 2958: 2954: 2948: 2945: 2943: 2940: 2938: 2935: 2933: 2930: 2928: 2924: 2923: 2920: 2916: 2913: 2912: 2909: 2906: 2904: 2900: 2899: 2897: 2895: 2894:erythematosus 2889: 2886: 2884: 2878: 2874: 2862: 2859: 2858: 2857: 2856: 2852: 2851: 2849: 2845: 2839: 2836: 2834: 2831: 2829: 2826: 2824: 2821: 2819: 2816: 2814: 2811: 2809: 2806: 2804: 2801: 2800: 2798: 2796: 2792: 2786: 2782: 2779: 2777: 2774: 2772: 2769: 2767: 2764: 2762: 2759: 2757: 2754: 2752: 2749: 2745: 2742: 2740: 2737: 2735: 2732: 2730: 2727: 2725: 2722: 2720: 2717: 2716: 2715: 2712: 2711: 2709: 2707: 2703: 2700: 2698: 2694: 2690: 2684: 2681: 2679: 2676: 2674: 2670: 2669: 2666: 2663: 2661: 2658: 2656: 2653: 2651: 2648: 2646: 2643: 2641: 2638: 2636: 2633: 2631: 2628: 2626: 2623: 2621: 2618: 2616: 2613: 2611: 2608: 2606: 2603: 2601: 2598: 2596: 2593: 2591: 2588: 2586: 2583: 2579: 2576: 2575: 2574: 2570: 2566: 2565: 2562: 2559: 2555: 2552: 2550: 2547: 2545: 2542: 2540: 2537: 2535: 2532: 2530: 2527: 2526: 2525: 2521: 2518: 2517: 2512: 2509: 2508: 2507: 2506: 2502: 2500: 2497: 2495: 2492: 2488: 2485: 2484: 2483: 2480: 2478: 2474: 2471: 2470: 2468: 2466: 2462: 2453: 2448: 2446: 2441: 2439: 2434: 2433: 2430: 2418: 2415: 2411: 2408: 2407: 2406: 2403: 2399: 2396: 2395: 2394: 2391: 2389: 2386: 2384: 2381: 2380: 2378: 2374: 2368: 2365: 2363: 2360: 2359: 2357: 2355: 2351: 2337: 2336:Tar melanosis 2334: 2332: 2329: 2328: 2326: 2322: 2316: 2313: 2311: 2308: 2306: 2303: 2301: 2298: 2296: 2293: 2292: 2290: 2284: 2278: 2275: 2271: 2268: 2266: 2265:Lichen aureus 2263: 2261: 2257: 2254: 2252: 2249: 2247: 2244: 2242: 2239: 2238: 2237: 2234: 2232: 2229: 2227: 2224: 2223: 2221: 2217: 2214: 2208: 2198: 2195: 2193: 2190: 2188: 2185: 2183: 2180: 2178: 2175: 2173: 2170: 2168: 2165: 2163: 2160: 2159: 2157: 2151: 2145: 2142: 2140: 2137: 2135: 2132: 2131: 2129: 2125: 2119: 2116: 2113: 2110: 2108: 2104: 2101: 2099: 2096: 2094: 2091: 2089: 2086: 2084: 2081: 2080: 2077: 2074: 2072: 2069: 2067: 2064: 2062: 2059: 2057: 2054: 2052: 2049: 2047: 2044: 2042: 2039: 2037: 2034: 2032: 2028: 2024: 2021: 2020: 2018: 2016:circumscribed 2012: 2006: 2003: 2001: 1998: 1996: 1993: 1991: 1988: 1986: 1983: 1981: 1978: 1976: 1973: 1971: 1968: 1966: 1963: 1962: 1960: 1956: 1953: 1951: 1946: 1941: 1937: 1934: 1932: 1928: 1918: 1915: 1913: 1910: 1908: 1905: 1903: 1900: 1898: 1895: 1893: 1890: 1889: 1887: 1883: 1877: 1874: 1872: 1869: 1867: 1864: 1863: 1861: 1859:hypomelanosis 1856: 1852: 1842: 1839: 1837: 1834: 1832: 1829: 1827: 1824: 1822: 1821:ABCD syndrome 1819: 1817: 1814: 1813: 1811: 1807: 1799: 1796: 1794: 1791: 1789: 1786: 1785: 1784: 1781: 1779: 1776: 1774: 1771: 1770: 1768: 1764: 1760: 1754: 1751: 1749: 1746: 1744: 1741: 1740: 1738: 1736: 1732: 1729: 1727: 1722: 1717: 1707: 1704: 1702: 1699: 1697: 1694: 1693: 1691: 1685: 1679: 1676: 1674: 1671: 1670: 1668: 1664: 1658: 1655: 1653: 1650: 1649: 1647: 1645: 1641: 1638: 1636: 1630: 1627: 1625: 1620: 1616: 1612: 1608: 1601: 1596: 1594: 1589: 1587: 1582: 1581: 1578: 1565: 1561: 1560: 1556: 1554: 1550: 1549: 1545: 1544: 1541: 1537: 1530: 1526: 1525: 1521: 1519: 1515: 1514: 1510: 1508: 1504: 1503: 1499: 1497: 1493: 1492: 1488: 1486: 1482: 1481: 1477: 1473: 1471: 1467: 1466: 1462: 1458: 1457: 1454: 1449: 1445: 1438: 1429: 1423: 1419: 1415: 1408: 1405: 1400: 1396: 1392: 1388: 1383: 1378: 1374: 1370: 1366: 1359: 1356: 1351: 1347: 1343: 1339: 1335: 1331: 1324: 1321: 1310:on 2011-07-09 1306: 1302: 1298: 1291: 1284: 1281: 1276: 1270: 1266: 1259: 1257: 1255: 1251: 1246: 1242: 1238: 1234: 1230: 1226: 1219: 1216: 1211: 1207: 1202: 1197: 1193: 1189: 1185: 1178: 1175: 1170: 1166: 1161: 1156: 1153:(2): 349–50. 1152: 1148: 1144: 1137: 1134: 1129: 1125: 1121: 1117: 1113: 1109: 1102: 1099: 1087: 1080: 1078: 1074: 1069: 1065: 1061: 1057: 1054:(11): 923–7. 1053: 1049: 1042: 1039: 1034: 1030: 1025: 1020: 1016: 1012: 1007: 1002: 998: 994: 990: 983: 980: 969:on 2018-04-12 968: 964: 960: 954: 951: 946: 942: 937: 932: 928: 924: 920: 913: 910: 905: 899: 895: 888: 886: 884: 882: 880: 878: 876: 874: 872: 868: 863: 857: 853: 846: 844: 842: 838: 834: 833:0-7216-2921-0 830: 826: 820: 818: 816: 814: 810: 805: 799: 795: 788: 786: 784: 782: 780: 778: 776: 774: 772: 770: 766: 755: 751: 745: 742: 731: 727: 721: 718: 713: 709: 705: 701: 697: 693: 686: 684: 682: 680: 678: 674: 671: 670: 665: 660: 657: 652: 646: 642: 638: 631: 629: 627: 623: 616: 614: 612: 604: 602: 595: 593: 590: 586: 585:blood glucose 578: 576: 569: 565: 562: 559: 556: 555: 554: 548: 546: 543: 541: 537: 533: 529: 521: 519: 512: 508: 504: 501: 497: 494: 490: 486: 482: 481: 480: 477: 475: 472:, as seen in 471: 467: 463: 462:keratinocytes 459: 458:IGF receptors 455: 451: 447: 439: 437: 430: 428: 426: 422: 418: 412: 410: 409:genitourinary 406: 398: 396: 394: 390: 386: 382: 374: 372: 368: 366: 358: 349: 344: 341: 337: 330: 325: 323: 317: 313: 309: 305: 304:leprechaunism 301: 297: 295: 291: 288: 286: 282: 278: 274: 270: 268: 264: 260: 256: 255: 254: 248: 242: 237: 233: 228: 224: 219: 215: 210: 206: 201: 199: 197: 189: 187: 185: 181: 177: 173: 169: 165: 157: 155: 153: 145: 143: 141: 137: 133: 129: 125: 124:keratinocytes 121: 117: 114:, as seen in 113: 109: 106:, especially 105: 100: 98: 94: 90: 86: 82: 78: 74: 70: 62: 59: 57: 53: 50: 45: 41: 36: 31: 19: 3394: 3306:Polymyositis 3278:Neurological 3022:atrophoderma 2908:Panniculitis 2853: 2838:Carbon stain 2729:Subcutaneous 2572: 2503: 2161: 2103:Poikiloderma 2027:Lentiginosis 1557: 1546: 1522: 1511: 1500: 1489: 1474: 1459: 1417: 1407: 1375:(1): 33–51. 1372: 1368: 1358: 1333: 1329: 1323: 1312:. Retrieved 1305:the original 1300: 1296: 1283: 1264: 1228: 1224: 1218: 1194:(3): 345–6. 1191: 1187: 1177: 1150: 1146: 1136: 1111: 1108:N Engl J Med 1107: 1101: 1089:. Retrieved 1051: 1047: 1041: 996: 992: 982: 971:. Retrieved 967:the original 962: 953: 929:(1): 25–31. 926: 922: 912: 893: 851: 824: 793: 757:. Retrieved 753: 744: 733:. Retrieved 729: 720: 695: 691: 667: 659: 640: 608: 599: 582: 573: 563: 557: 552: 544: 525: 516: 478: 443: 436:malignancy. 434: 413: 402: 378: 369: 362: 321: 257:starts with 252: 193: 161: 149: 101: 68: 67: 3430:Tripe palms 3087:Perforating 2957:Scleroderma 2925:ungrouped: 2828:Soot tattoo 2724:Generalized 2719:Perforating 2693:Necrobiosis 2473:keratoderma 2331:Carotenosis 1958:Reticulated 1689:development 1635:melanocytes 1548:MedlinePlus 1336:(1): 1–19. 730:Mayo Clinic 425:tripe palms 419:, multiple 128:fibroblasts 61:Dermatology 3475:Categories 3301:Opsoclonus 3125:Skin ulcer 3035:Anetoderma 2901:chronic: 2881:localized 2383:Skin color 2354:Dyschromia 2300:Chrysiasis 2036:Liver spot 1855:Leukoderma 1763:Melanosome 1696:Piebaldism 1687:Melanocyte 1611:Dyschromia 1513:DiseasesDB 1314:2010-07-29 1114:(9): e10. 973:2020-03-01 759:2021-08-13 735:2021-08-13 617:References 505:Increased 493:fibroblast 281:acromegaly 261:, such as 176:acromegaly 3362:Reactive 3222:Endocrine 2942:Verrucous 2927:Chilblain 2697:granuloma 2520:keratosis 2505:psoriasis 2155:ungrouped 1945:Melanosis 1885:Ungrouped 1753:in humans 1726:amelanism 1666:Syndromic 1559:eMedicine 1529:402599005 1524:SNOMED CT 1091:23 August 1015:2229-5178 613:in 1889. 596:Prognosis 579:Treatment 564:Malignant 528:endoscopy 522:Diagnosis 417:skin tags 395:therapy. 336:skin tags 300:pinealoma 273:androgens 56:Specialty 3364:erythema 3017:Atrophic 2919:Neonatal 2915:subacute 2376:See also 2212:pigments 2014:Diffuse/ 1950:Melanism 1766:transfer 1735:Albinism 1719:Loss of 1644:Vitiligo 1369:Medicine 1169:17224380 1128:17761587 1033:27990384 945:20464083 712:19061584 698:(9): 2. 536:diabetes 134:such as 97:forehead 2962:Morphea 2903:Discoid 2410:removal 2398:Sunless 2393:Tanning 2295:Argyria 2167:Freckle 2083:Melasma 2023:Lentigo 1940:Melanin 1721:melanin 1632:Loss of 1624:leucism 1507:D000052 1399:2241453 1391:4868603 1350:8021347 1245:8021347 1210:7263979 1068:6257767 1024:5134163 605:History 513:(EGFR). 454:insulin 85:armpits 75:of the 3164:Ainhum 2877:Dermis 2833:Tattoo 2673:Keloid 2585:Callus 2567:other 2405:Tattoo 2288:metals 2153:Other/ 2127:Linear 1931:Hyper- 1564:derm/1 1553:000852 1496:100600 1424:  1397:  1389:  1348:  1271:  1243:  1208:  1167:  1126:  1066:  1031:  1021:  1013:  943:  900:  858:  831:  800:  710:  647:  558:Benign 540:cancer 532:X-rays 391:, and 314:, and 158:Causes 83:, the 49:axilla 3439:Other 3235:SIADH 3142:Other 2937:Tumid 2324:Other 2286:Other 2210:Other 1809:Other 1619:Hypo- 1485:701.2 1395:S2CID 1308:(PDF) 1293:(PDF) 754:WebMD 530:, or 485:IGF-1 423:, or 387:use, 93:navel 89:groin 2219:Iron 1502:MeSH 1491:OMIM 1480:9-CM 1422:ISBN 1387:PMID 1346:PMID 1269:ISBN 1241:PMID 1206:PMID 1165:PMID 1124:PMID 1093:2013 1064:PMID 1029:PMID 1011:ISSN 941:PMID 898:ISBN 856:ISBN 829:ISBN 798:ISBN 708:PMID 645:ISBN 611:Unna 292:and 265:and 152:dark 110:and 81:neck 77:skin 2883:CTD 1857:w/o 1476:ICD 1470:L83 1461:ICD 1377:doi 1338:doi 1233:doi 1196:doi 1155:doi 1116:doi 1112:357 1056:doi 1019:PMC 1001:doi 931:doi 700:doi 666:at 538:or 468:or 460:on 182:or 138:or 3477:: 2917:: 2571:: 2522:: 2475:: 2029:: 1562:: 1551:: 1527:: 1518:58 1516:: 1505:: 1494:: 1483:: 1468:: 1465:10 1393:. 1385:. 1373:47 1371:. 1367:. 1344:. 1334:31 1332:. 1301:13 1299:. 1295:. 1253:^ 1239:. 1229:31 1227:. 1204:. 1190:. 1186:. 1163:. 1151:56 1149:. 1145:. 1122:. 1110:. 1076:^ 1062:. 1050:. 1027:. 1017:. 1009:. 995:. 991:. 961:. 939:. 927:85 925:. 921:. 870:^ 840:^ 812:^ 768:^ 752:. 728:. 706:. 696:14 694:. 676:^ 639:. 625:^ 476:. 427:. 383:, 306:, 302:, 283:, 279:, 178:, 174:, 166:, 126:, 95:, 91:, 87:, 3206:e 3199:t 3192:v 3166:/ 3019:/ 2959:/ 2879:/ 2783:/ 2695:/ 2451:e 2444:t 2437:v 2258:/ 2114:) 2105:( 2025:/ 1947:/ 1942:/ 1723:/ 1621:/ 1609:/ 1599:e 1592:t 1585:v 1478:- 1463:- 1453:D 1430:. 1401:. 1379:: 1352:. 1340:: 1317:. 1277:. 1247:. 1235:: 1212:. 1198:: 1192:5 1171:. 1157:: 1130:. 1118:: 1095:. 1070:. 1058:: 1052:6 1035:. 1003:: 997:7 976:. 947:. 933:: 906:. 864:. 835:. 806:. 762:. 738:. 714:. 702:: 653:. 570:. 318:. 20:)

Index

Acanthosis nigricans type II

axilla
Specialty
Dermatology
hyperpigmentation
skin
neck
armpits
groin
navel
forehead
endocrine dysfunction
insulin resistance
hyperinsulinaemia
diabetes mellitus
insulin-like growth factor receptors
keratinocytes
fibroblasts
growth factor receptors
fibroblast growth factor receptors
epidermal growth factor receptor
dark
insulin resistance
Type 2 diabetes
hypothyroidism
acromegaly
polycystic ovary syndrome
Cushing's disease
autosomal dominant

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