What is acanthosis nigricans?
A person with acanthosis nigricans has dark brown, velvety patches on the skin.

What are the symptoms of acanthosis nigricans?
In acanthosis nigricans, the skin changes occur most commonly in the skin folds, such as the armpits, neck or groin.

How does the doctor treat acanthosis nigricans?
The treatment of acanthosis nigricans depends on the underlying cause. Treatment may range from observation (wait for skin lesions to go away on their own) to medications and laser surgery.