Whether or not to leave scars after an injury is mainly related to the following factors: 1. the degree of injury. Generally speaking, the more serious the injury, the greater the possibility of scarring and the more severe the scarring. You can refer to my article “Characteristics of different burn depths and the possibility of scarring”. 2. Infection. Infection occurs during the healing process and will undoubtedly aggravate scar formation. 3. Healing speed. The faster the healing, the lower the possibility of scar formation. 4. Genetic factors. That is, patients with scarring constitution will be significantly scarred. 5. Treatment after healing. All anti-scar treatments can only be started after healing. Please refer to my article “Treatment of scar (scar) growths” for more details.