Skin Care Device Used To Help Rejuvenate The Skin, Treat Skin Scarring.A derma roller is a skin care device used to help rejuvenate the skin, treat acne scarring, & reduce signs of aging, without cause actual damage to the outer layer of skin. It helps make unsightly scars appear less obvious, while smoothing way wrinkles lines, folds & skin ageing. The micro-needles naturally increase the levels of collagen & elastin in the skin.