Acanthosis nigricans is a common skin pigmentation disorder. The sign of acanthosis nigricans are usually found as dark patches of skin with a thick, velvety texture. It is usually found in body folds, such as the posterior and lateral folds of the neck, the armpits, groin, navel, forehead, and other areas.
The skin changes of acanthosis nigricans (ak-an-THOE-sis NIE-grih-kuns) typically occur in people who are obese or have diabetes. Children who develop the condition are at higher risk of developing type 2 diabetes. Rarely, acanthosis nigricans can be a warning sign of a cancerous tumor in an internal organ, such as the stomach or liver.
Disease statistics: In 2002-03, 0.001% (178) of hospital consultant episodes were for acanthosis nigricans in england. 100% of hospital consultant episodes for acanthosis nigricans required hospital admission and 44% of hospital consultant episodes for acanthosis nigricans were for men and 56% were women, 3% required emergency services. 51 is the mean age of occurance, 54% occured in 15-59 year olds and 15% in over 75.