Xerophthalmia

acanthosis nigericans

acanthosis nigericans (click to veiw full screen)

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

Clinical cases and disease images