Acanthosis Nigricans Remedies

Question: I think I have acanthosis nigricans.I'm 28 years old women. I've been overweight since childhood, and i have developed dark underarms, inner thighs and waistline, and a little discoloration in the neck. I haven't seen a doctor yet. I've been exercising for the past few months and have lost approximately 40 pounds since last year. but still the dark patches are still there. I tried peeling products, they did peel, but still, my underarms were still dark. . I would appreciate any advice or suggestion on how to get rid of this ugly dark patches. Please help.