You can have long term improvement in some acne scars. For depressed scars, a strong chemical peel using a toothpick can help raise the depressed scars/pock marks. Also, this can be done with the co2 laser.

The other way to improve those scars is just to incise them and remove the scars and carry out a reclosure. This new incision can then be resurfaced with a chemical peel or laser to improve the appearance of the new incision. This can be done all throughout your face. It takes a lot of work but it can be done and a noticeable improvement can be accomplished.

Studies show that most resurfacing and peels can last 8-10 years.  This is the time it will take to return to what you had prior to the peel or resurfacing.