Acanthosis nigricans Acanthosis nigricans is a skin disorder in which there is darker, thick, velvety skin in body folds and creases.It presents as velvety brown thickened skin of the neck,axilla and over the joints of the fingers and toes. Causes of Acanthosis Nigricans 1. Familal 2. Obesity-related.The majority of cases are associated with obesity and otherwise idiopathic. This is […]