Depressed scars can be repaired and flattened. Depressed scars are caused by acne, trauma, chicken pox and other etiologies that lead to skin dermal layer and subcutaneous tissue defects, which are difficult to recover on their own during the healing process due to the lack of collagen and elastin, and need to be treated through professional treatment methods. Treatment is generally divided into non-surgical treatment and surgical treatment. Non-surgical treatment includes colored light, filler, grinding and other ways to treat through laser method, which is relatively slow. The use of filler treatment, such as hyaluronic acid or collagen for local filling, is relatively effective and has a relatively fast recovery time. Also, depending on the patient’s body condition, grinding can be used, which means that the surrounding raised normal skin is properly sharpened, but it is difficult to restore it to exactly the same state as before and can only be improved to a certain extent. Larger scars due to trauma can be treated surgically, but subtle scars remain after surgery. To perform depressed scar repair, you need to go to a local regular hospital, pay attention to the cleanliness and hygiene of the scar area during treatment, eat more nutritious food in terms of diet, avoid overly greasy and stimulating larger diet, and ensure sufficient rest time to facilitate recovery.