Acanthosis nigricans: You might have acanthosis nigricans which can be a sign of diabetes which is why your doc prescribed you metformin to improve your sensitivity to insulin. Pay attention to what you eat & get physically active. Lose belly fat & hopefully your skin will return to normal & you might be able to stop medication under his/her watch. Check out http://www.Mayoclinic.Com/health/acanthosis-nigricans/ds00653.
Answered 3/17/2017
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