Burns and other traumatic injuries (e.g., car accident injuries, machine injuries) are very common and often leave a variety of scars after the injury, some of which have little meaningful surgical treatment, some of which require immediate surgical treatment, and some of which require elective surgical treatment. Lay people are often confused about when to operate and either delay treatment or ask the doctor to do the surgery that should be postponed. First of all, let’s talk about the cases that do not require surgery: 1. The trauma heals within 2 weeks, leaving only skin pigmentation and scarring is not obvious. 2.Flat scar on the non-exposed area (the texture is harder than the skin, the color is darker than the skin, and the scar is basically not higher than the surrounding skin). 3. Although it is an exposed scar, the scar is very close to normal skin, or it is a linear scar, and there is little room for surgical improvement. The scar that needs immediate surgical treatment: 1. The scar already affects the function of the limb or organ, such as: the contracture scar around the mouth that affects eating, the scar around the eye that affects closing the eye, the contracture scar in the large joint area that affects joint activities, the scar on the hand that affects the flexion and extension of the fingers. 2, scar pulling affects children’s development, such as severe contracture scar of limbs. 3.Keloid ulcers that have not healed for a long time or have become malignant. Stable scar on the face and other exposed areas (scar formation to stability usually takes about 6 months), which does not affect the function but only the aesthetics. In this case, the surgery can be postponed. The last case that requires postponed surgery: proliferative scar that does not affect the function and development (healing time is more than 2~3 weeks, the scar is red and tough, with pain and itching). It should be treated conservatively first (topical medication, compression therapy, injection therapy, etc.) and then surgically after the scar has matured (manifested by symptom relief, darkening and softening).