ACANTHOSIS NIGRICANS is a brown to black, poorly defined, velvety hyperpigmentation of the skin. It is usually found in body folds, such as the posterior and lateral folds of the neck, the axilla, groin, umbilicus, forehead, and other areas. The most common cause of acanthosis nigricans is insulin resistance, which leads to increased circulating insulin levels. It is also a prominent feature of obesity| Read more here http://en.wikipedia.org/wiki/Acanthosis_nigricans
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Acanthosis nigricans is a skin condition when the skin becomes darker and thicker. Moreover, the affected areas often feel velvety. This skin condition is an aesthetic issue and it isn’t congenerous.
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A body that carries an excessive plenty of fat undergoes changes in hormone levels. At these times, darkened, velvety patches known as acanthosis nigricans can form, in areas where pores and skin folds and overlaps just like the knees especially, elbows, groin, armpits, and throat. Patches might appear gray, brown, or dark. Weight loss can enhance the look of acanthosis nigricans.