The treatment for post inflammatory hyperpigmentation includes various skin
creams like hydroquinone, azelaic acid, corticosteroids, tretinoin cream and laser treatment
. If it still persists then you can go in for laser treatment, dermal fillers,Chemical peeling or microdermabrasion. Avoid picking, harsh scrubbing, and abrasive treatments unless prescribed by a dermatologist during this period.
Hope it helps.