PIH After Use of Retin-A on Thighs?

Hi, I'm 25 years old and I started using retin-a on my thighs for some discoloration I had. After a week of use I developed really brown, burnt skin. I am brown skin but never had this. Its been over a year and my thighs are two-tone. You can actually see the line of demarcation from where I did and didn't use the retin-a. The skin is not keloid or hard. Its soft but darker than my outer thighs. I have tried vitamin e, amlactin, and most types of oils recommended for scars. Would peels or lasers work?