Familial acanthosis nigricans
Encyclopedia
Familial acanthosis nigricans (also known as "Acanthosis nigricans type II") is an exceedingly rare type of acanthosis nigricans
that is present at birth or develop during childhood.
Acanthosis nigricans
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.-Causes:...
that is present at birth or develop during childhood.