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Acanthosis Nigricans

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 area.

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).

By Healthwise Staff
Primary Medical Reviewer E. Gregory Thompson, MD - Internal Medicine
Specialist Medical Reviewer David C.W. Lau, MD, PhD, FRCPC - Endocrinology
Last Revised June 20, 2012

WebMD Medical Reference from Healthwise

Last Updated: June 20, 2012
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.