This has been a recent introduction in the field of cosmetology. The principle is very simplistic, it works on the principle that any trauma to the skin starts the wheels of reparation and collagen induction in the skin. The dermaroller is used to create multiple such micro wounds in the skin. The skin recognises this as trauma and starts laying down new collagen. This collagen induction is natural, permanent and free of side effects.
It can be used effectively to treat acne scars and also for rejuvenating wrinkled skin.