Definitions for acanthosis nigricans
acanthosis nigricans, keratosis nigricans(noun)
a skin disease characterized by dark wartlike patches in the body folds; can be benign or malignant
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.
U.S. National Library of Medicine
A circumscribed melanosis consisting of a brown-pigmented, velvety verrucosity or fine papillomatosis appearing in the axillae and other body folds. It occurs in association with endocrine disorders, underlying malignancy, administration of certain drugs, or as in inherited disorder.
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