Lactic Acid 50% Did Not Do Much for Discoloration Around Mouth. Could TCA 12% Do the Trick? How About IPL?

I have discoloration/scarring around my mouth. I used to have Angular Chelitis and I would lick the areas around my mouth, causing discoloration. I also have difficulty opening mouth sometimes. It looks like this but on both sides I have tried microdermabrasions, one-time Lactic Acid 50% peel, Minocycline, Calendula Cream, B Complex, acidophillus, alot! I don't know what to do anymore. FYI I have tan Asian skin.