Acanthosis nigricans is a skin condition in which brown or black velvet-like markings appear under the arms, in the groin, or on the back of the neck. Any skin fold can be affected, including the lower lip and chin.
Causes of acanthosis nigricans may include:
Risk factors that increases your chance of getting acanthosis nigricans include:
If you experience any of these symptoms, do not assume it is due to acanthosis nigricans. These symptoms may be caused by other health conditions.
Your doctor will ask about your symptoms and medical history. A physical exam will be done. Tests may include the following:
Treatment often involves treating the underlying cause. For example, if acanthosis nigricans is due to obesity, weight loss can improve the skin condition.
Topical and oral retinoids and other medicines have been reported to improve appearance in some cases. They help remove excess layers of skin.
The best way to reduce your chances of getting acanthosis nigricans is to maintain a healthy weight through diet and regular exercise.
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Last reviewed March 2013 by Brian Randall, MD
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