There are many good scientific studies showing that
medical micro-needling works well for acne scarring, however, I am not a fan of rollers as they
create a more erratic pattern of "tears" through the skin rather than
the clean, more evenly distributed punctures seen with the motorized
micro-needling machines. In my office we have found the RejuvaStamp micro-needling machine to be the best of the motorized machines. We are also using the Rejuva Skin Care system which combines motorized micro-needling with RejuvaCells human growth factor serum made from human stem cells to give the best results.
You can follow the video link above to learn more about micro-needling
and human growth factor serums.