I have had acne in the recent years, and some have cleared up while some are still there. Most of my acne, other than the few puss-filled ones, are mainly the hard under the skin ones and many white heads. I noticed recently that I now have scars - the ones were they sink into the skin and shaped like a jagged line. What ingredients should I use to help reduce the sunken skin area?

Theoretically, glycolic acid should clean up and break down excess skin cells and help circulation, which would than increase collagen, but would that help me reduce those scars? HELP! I want clear skin and to wear minimal makeup.