Dr. Sasaki, a top plastic surgeon in Pasadena, Calif., explains the origin of microneedling and its mechanism of action. Dr. Sasaki describes the wide-range of microneedling applications, including skin rejuvenation, scar treatment, hair stimulation, wrinkles, thinning skin and striae. The array of needles featured on microneedling devices create thousands of microscopic wounds, which stimulates wound healing, neocollagenesis and tightening in the treated area. These channels also allow better penetration of topical products for enhanced rejuvenation and repairing results. Dr. Sasaki specifically demonstrates Dermapen, an adjustable microneedling device that he uses in his practice.