What is the best way to treat post-acne blemishes? i have them since four years. i have tried salicylic acid, chemical peels and sunscreens.

Blemish: Retinoid topicals such as prescription retin a (tretinoin) , tazorac, etc. May prove helpful. Topical fading creams containing hydro quinone or kojic acid may be recommended. See a dermatologist for proper diagnosis and treatment options.

None will work: Your acne scars will be with you for the rest of your life unless you choose to have a dermatologist help you hide them and even this it's plus-minus. The "chemical peels" are scams & the other won't work either. Hollywood's chris pine (photo) had pretty good success having massive acne scarring largely reversed though he still hides it with beard stubble. Nobody says he doesn't look fine.