Acne scar is a common complication of acne which mainly occurs following severe and inflammatory acne (occasionally small comedones can cause it too). Due to inflammation, the tissue doesn't heal properly and defects remain on the face which may be visible even under makeup and from a distance. Such scars are often permanent if not treated.

Red-black pigmentation following acne which some categorise as acne scars do fade with time, but that requires months to years by itself. You can go for chemical peels, laser toning and carbon peel for quick improvement of such scars. However if you have raised or depressed scars which can be felt by touch, you would need multiple sessions of procedures like local injections of steroids, microneedling radiofrequency and laser resurfacing to make any significant difference. This would have to be done under medical supervision with careful pre and post procedure care.

If you have current active acne, the best plan would be to treat the breakout so that acne scar doesn't occur or occurs minimally. For that your doctor may prescribe you medicines to apply or do a chemical peel like salicylic acid peel to keep the inflammation down.

Start with a good skincare regimen consisting of non comedogenic sunscreen, mild cleanser and moisturiser, and avoid makeup to heal the current crop of acne. Visit a dermatologist for proper diagnosis and treatment.