Hi
Your friend seems to be having a condition called Acanthosis Nigricans. In this condition, there is a thickening and darkening of skin over the flexural areas of the skin like the neck, underarms, groins etc. In extreme cases, it can also involve face, knuckles and whole body. The most common cause is obesity or excessive weight gain. Familial cases have also been noted.
The treatment includes change in diet and exercise to reduce the weight. If the skin does not return to normal then some glycolic acid based creams may help lighten the skin
Answered2015-08-13 16:20:39
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