I self-administered 50% glycolic acid several months ago. I'd had experience with acids (mostly 30%) and had been very careful; however, last time (2-3 minute application) I ended up with redness which I understand was normal, but although it has generally subsided over time, it still stayed around and I can tell the area on which I used the acid last time.
The overall pinkness bares a contrast with my upper lip
hyperpigmentation includes various skin creams like hydroquinone, azelaic acid, corticosteroids, tretinoin cream and laser treatment.Apply hydroquinone cream on these scars and it should go away in a few days to months.If it still persists then you can go in for laser treatment, Chemical peeling or microdermabrasion.
Hope it helps.Take care and pls do keep me posted on how you are doing or in case you have any additional doubts.Kind regards.