Acanthosis nigricans is a skin disorder in which there is darker, thick, velvety skin in body folds and creases.
Acanthosis nigricans can affect otherwise healthy people, or it can be related to medical problems. Some cases are genetically inherited. The condition is most commonly seen among people of African descent, in part because it is easier to see in darker skin.
Obesity can lead to acanthosis nigricans, as can some endocrine disorders. It is...
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