Acanthosis nigricans is a skin disorder that results in velvety, light-brown-to-black markings that can occur in any location but mainly are found in the skin folds of the neck, armpits, groin, and under the breasts.
What causes acanthosis nigricans?
Acanthosis nigricans can affect otherwise healthy people, or it can be associated with certain medical conditions. Sometimes acanthosis nigricans is congenital (something a person is born with). It is more likely to be seen in people with darker skin. The most common type is found in conditions that are associated with an elevated insulin blood level, such as in diabetes and obesity. There are many other possible causes of acanthosis nigricans, including:
