When used for scar removal, the derma roller creates micro-injuries in the skin, triggering collagen production and reducing the appearance of scars over time. It can be used on various types of scars, including acne scars, surgical scars, and stretch marks. Derma roller is a handheld device with fine needles designed to stimulate the skin's natural healing process. It is used for hair regrowth by creating tiny punctures in the scalp, promoting blood flow and encouraging hair follicle stimulation. It is used for hair regrowth by creating tiny punctures in the scalp, promoting blood flow and encouraging hair follicle stimulation. › See more product details