Acanthosis nigricans is a brown to black, poorly defined, velvety hyperpigmentation of the skin, usually present in the posterior and lateral folds of the neck, the axilla, groin, umbilicus, and other areas.


... Acanthosis nigricans is a skin disorder characterized by dark, thick, velvety skin in body folds and creases. ...
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Acanthosis Nigricans Other

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Acanthosis Nigricans
... What is acanthosis nigricans? Acanthosis nigricans is a skin disorder that results in velvety, light-brown-to-black markings that occur in areas including the neck, armpits and groin. What causes acan...
Source: Cleveland Clinic