Suggest Treatment For Acanthosis Nigricans

i have severe condition of acanthosis nigricans and i started to notice it after 12 years of age that is after i had my first periods. after my marriage i put on weight and also my doctor told me i have got polycystic ovary. what is the best treatment i want to know it. i am very upset because my neck and my armpits are very dark. please find me a solution.