Scarred people are a very small percentage of the population and are characterized by persistent increases in surface scars after wound healing, which not only affect the appearance, but also local pain, redness and itchiness, and scar contraction that also affects functional movement. Because scarring is so rare, some books refer to people with scarring as scarring. Scarring is characterized by the outward growth of a scar after a wound has healed, raised above the skin surface, hard, and can also be painful. Scar is a very general concept, which is a collective term for the change in the appearance and histopathology of normal skin tissue caused by various traumas. It is a normal and inevitable physiological reaction in the natural healing process of wounds or traumas after human trauma, and is also the inevitable result of the healing process of trauma.