Regarding the medical treatment,it includes various skin creams like hydroquinone, azelaic acid, corticosteroids, tretinoin
cream and laser treatment.Apply hydroquinone
cream on this scar 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. Avoid picking, harsh scrubbing, and abrasive treatments unless prescribed by a dermatologist during this period.
Hope it helps.