[Skin Concerns] Angular Cheilitis scar wont go away

The corners of my mouth are significantly darker than the rest of my skin. It has been like that for a while and I've tried all sorts of things like using glycolic AHA lotion and taking vitamin gummies, but it hasn't done anything to heal the scarring.

Here is a picture to describe what I'm talking about https://i.imgur.com/TBVxwMV.jpg

Has anyone also experienced this scarring for a long period of time and managed to fix/heal the scars? If so, what can I do to fix mine? Thanks!!