1.What is scarring? Scars can be formed by any factors that can cause damage to the skin surface and deep layers and destroy the skin surface and deep layers. 2, the causes of scars: various injury factors including: abrasions, bruises, lacerations, cuts, puncture wounds, avulsion wounds, infection, necrosis, freezing, fire, boiling water, electric shock, electrocoagulation, laser, drugs, cosmetic surgery and surgery, and some unnoticed and unremembered minor injuries can form scars. 3. Factors affecting the formation of paralysis scars: 1. ethnicity and skin pigmentation 2. age 3. physique 4. familiality 5. location 6. shape of trauma or surgical incision 7. direction of trauma or surgical incision 8. angle of trauma or surgical incision 9. inactivated tissue in trauma or surgical incision 10. presence of foreign body or hematoma in trauma or surgical incision 11. suture method, suture material, suture tightness 12. presence of infection in trauma or surgical incision 13. stitch removal Wound healing and survival of transplanted skin and flap 4. treatment of scars: early prevention of scars, early rehabilitation and surgical treatment of scars, as the child grows scars will continue to repair and improve the symptoms. Restore into a better shape. (a) Early prevention and limitation of scar growth: Prevention is very important before the appearance of scars, and once they appear, it is a long process to deal with them. The methods of prevention are: 1. Compression: pressure is applied to the scar to make it ischemic and make it shrink. 2.Physiotherapy: use physical methods such as audio for rehabilitation. 3.Drug prevention: use of de-inflammatory pine type drugs, silicone preparations, herbal medicine, etc. 4.Freezing, laser non-surgical treatment. (II) Treatment 1.Non-surgical treatment: laser photon therapy, hormonal drug therapy, compression therapy, silicone preparation therapy. 2.Surgical treatment: scars in special areas that cause abnormalities in function or shape need surgical treatment, such as lid scars that cause lid ectropion, facial scars that affect beauty, and joint scars that affect joint activities.