Acne scarring is common and hard to predict; even mild acne can lead to some form of scarring.
Scarring stems from injury to the skin that results in either a loss of skin tissue or the build-up of excessive skin tissue. There are several types of scars, including ice-pick scars (most common, forming deep pits in the skin), rolling scars (deep, wavelike scars), boxcar scars (pitted scars with a crater-like appearance) and hypertrophic scars (elevated scar tissue that presents as bumps on the skin surface).
Prevention of initial scarring is vitally important, but if scars do develop there are several ways to treat them. Doctors and dermatologists often prescribe retinoic and retinoid creams and gels to treat mild superficial scarring. This treatment aids in the production of collagen helps your skin build new and unscarred tissue.