For the skin darkening, you can try various skin creams like hydroquinone, azelaic
acid, corticosteroids or tretinoin cream.Apply hydroquinone
cream on the scars 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.