Scarring can cause localized fibrosis of the skin tissue, dermal atrophy, and can damage hair follicles. When the skin is traumatized and the wound recovers, the appearance of skin scars is a normal skin repair process. Scars can cause progressive, irreversible destruction of hair follicles, histological changes in fibrosis, dermal atrophy and permanent loss of hair follicles, so scars can damage hair follicles, scar damage to the site, generally will not grow hair again. If only damage to local hair follicles, did not cause scar hyperplasia, just affect the aesthetics, does not affect the physiological function, generally do not need special treatment; if there is scar hyperplasia or affect the physiological function, it is recommended to go to the hospital in time for further examination and diagnosis.