Health's Book

Definition

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

Symptoms

Acanthosis nigricans usually appears slowly and doesn't cause any symptoms other than skin changes.

Eventually, dark, velvety skin with very visible markings and creases appears in the armpits, groin, and neck. Sometimes, the lips, palms, soles of feet, or other areas may be affected.