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).
E. Gregory Thompson, MD - Internal Medicine & Adam Husney, MD - Family Medicine & David C.W. Lau, MD, PhD, FRCPC - Endocrinology
The Health Encyclopedia contains general health information. Not all treatments or services described are covered benefits for Kaiser Permanente members or offered as services by Kaiser Permanente. For a list of covered benefits, please refer to your Evidence of Coverage or Summary Plan Description. For recommended treatments, please consult with your health care provider.