Not a lot you can do. I gather that redness -as opposed to other scarring- is the main problem? Generally, sloughing off the skin helps regenerate the collagen and reduces scarring, but it takes awhile.
I recently started using hyaluranic acid (sold ny vitaminshoppe.com and source naturals as "injuv")on my skin, as it's great for connective tissue, of which SKIN is definitely some! I cut open the capsule and applied directly.
I must say I was surprised and pleased at how it faded old redness from old pimples. My skin looked healthier within days, and healed the few minor zits not affected by jan marini's transformation serum, which I highly recommend.
I'm thinking it would be amazing if Acne (and scarring) is caused by skin's connective tissue disorder... check out this site on HA;