Talk to Dermatologist on Acne, Red Marks, Pigmentation.

I have these red spots after acne and persistent acne on high cheekbone area specifically I'm using 3 times a week adaplene gel it's been 1.5 month I'm using adaplene and Clindamycin lotion and use azelaic acid cream on spots but not fading also have some brown spots and pigmentation I wht should I do if I increase adaplene my barrier gets damaged. I have small acne open comodones acne with small white pus very small on cheeks, forhead. Idk wht to do. Should I add salicylic acid serum in my routine. This is causing me anxiety as well. I'm severely underweight as well and my skin is very thin I can see veins under my eyes and nostrils area so wht can be done to thicken skin? I heared about copper peptides. Please guide me doctors.