There are two different ways to exfoliate: manual and chemical. My favorite type of manual exfoliation is microdermabrasion. You can either get microdermabrasion done by a dermatologist or by using the PMD. There are many different chemical exfoliants, some are in at home use products and some are stronger that should only be used by a dermatologist. I find that by using a weaker product more regularly is just as effective as getting a chemical peel a few time a year. My favorite face wash is Mario Badescu Glycolic Foaming Cleanser which does a fantastic job at exfoliation. Be very careful when you first begin exfoliating, it can often irritate the skin.
I recently wrote a dedicated blog post on derma rolling that you can read here. I have found that derma rolling has been the most effective way to reduce my acne scarring. You can purchase a derma roller here.
Long exposure to the sun can make scarring worse so it is important to use sunscreen on a DAILY basis. You can see all my favorite sunscreens here.