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Acanthosis Nigricans

Acanthosis nigricans is a rare condition characterized by a brown to black velvety growth on the outer skin with intense darkening of the skin 

The most common places acanthosis nigricans are seen are the back of the neck, under the arms, under the breast or in the groin. Rarely acanthosis nigricans is associated with a tumor. In these cases acanthosis can bee seen in extra places, such as the lips or hands and is unusually severe

Causes of acanthosis nigricans

The most probable cause is elevated levels of insulin. Most patients with acanthosis nigricans have higher than normal levels of insulin.

Obesity can lead to acanthosis nigricans, as can many endocrine disorders. It is frequently found in people with diabetes.

Acanthosis nigricans can be congenital

It can also be caused by an endocrine disorder

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