Acanthosis nigricans: Acanthosis nigricans is a brown to black, poorly defined, velvety hyperpigmentation of the skin. Common affected areas include the neck, underarms, and groin. This is usually seen in people under age 40 with obesity as well as conditions such as hypothyroidism or hyperthyroidism, acromegaly, polycystic ovary disease, insulin-resistant diabetes, or cushing's disease. See your doctor for evaluation.
Answered 10/23/2017
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