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.

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

   

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