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Acanthosis nigricans is a skin condition that results in
darkened skin and velvety growths that look like warts. These skin changes can
occur under the arm, on the back of the neck, over finger and toe joints, or in the groin and genital
In adults, acanthosis nigricans may be a sign of
disorders of the hormone system (endocrine system). It can occur in people who are very overweight
(obese). It may be a sign of lung cancer or of a cancer of the digestive system. It can
occur in people who have type 2 diabetes and in people who are resistant to insulin
but have not yet developed type 2 diabetes. Acanthosis nigricans can occur
in women who have polycystic ovary syndrome (PCOS).
Current as of:
May 22, 2015
E. Gregory Thompson, MD - Internal Medicine & David C.W. Lau, MD, PhD, FRCPC - Endocrinology
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