How much percentage of improvement can I expect from Derma Rolling for my acne scars on cheeks?

Microneedling is effective in improving acne scars but many treatments may be necessary, sometimes combined with PRP.I recommend both microneedling with PRP and eMatrix.BestDr. Karamanoukian

It can definitely help. With a 2 mm roller, you will need local numbing cream and after that some antibiotic cover (out of safety).Best for rolling, tethered and atrophic scars. Video below to show you how to roll properly, and also the evolution of skin needling. Insulated Energy Micro needling with PRP is now the Gold Standard of needling. All the bestDr Davin LimLaser DermatologistBrisbane, Australia. 

There are scientific studies showing micro-needling can give as good or better results than fractionated laser treatments and at a fraction of the cost! In my office, we are seeing excellent results treating acne scars using medical micro-needling combined with the application of human growth factor serums at the time of the treatment. We use the ProCell Therapies system which combines motorized
micro-needling with growth-factor serums derived from human stem cells that are specifically made for
micro-needling.We recommend more aggressive monthly office treatments with a motorized micro-needling machine. At home, patients can continue with weekly or biweekly treatments with a hand-held device. I have my patients use growth-factor serums with these home treatments as well. Results are often seen as early as within the first few months.