I use Dermaroller for eight months to treat acne scars on the neckline. Can only report good results. The Dermaroller has the unevenness of Hautoberflaeche Compensate beautiful. For the face, where I do not have acne problems, I use the machine for skin rejuvenation. The skin is definitely firmer. One must not forget, a new Gaeret to buy when the nails are flat. It is important before and after each use, a Dezinfizierung.