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.
Acanthosis nigricans is seen in both men and women and most commonly seen in those who are overweight or have diabetes or perdiabetic condition. Acanthosis nigricans skin patches occur when epidermal skin cells begin to reproduce rapidly. This abnormal skin cell growth is most commonly triggered by high levels of insulin in the blood.
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.