Topical treatments such as Retin-A, alpha hydroxy acid (AHA), or glycolic acids may also be used to remove some of the superficial layers of the skin and improve skin texture. This is especially true as an adjunct to laser treatment.
Dermal filler agents are also used to treat acne scars. The fillers are injected into the skin to push up the acne scars. The problem with dermal fillers for acne scarring is that you have to repeatedly inject the same areas over time, I think that strategy may not be the best for the deeper acne scars.
Another treatment is called subcision, which involves the surgical freeing-up of the deeper layers of the skin so its not so bound down. Another treatment, mainly of ice pick scars, is punch excision.
source : acnescars
