Acne may heal with scar and pigmentation.
If you are just having red pigmented areas post acne healing, using a good sunscreen, avoidance of sun exposure, application of pigmentation reducing creams like Kojic or skinlite
along with salicylic acid
or Glycolic acid
peels 15 days apart would help in treating them. But if these are scars, only taking peels would not suffice. Few sessions of microdermabrasion
or dermarollers would be required along with peels. Hope that answers your query. Take care.