The surface of the implant is concave, which may be due to scar repair contracture, local tissue loss or necrosis, or liquefaction of subcutaneous tissue such as fat. 1. Keloid contracture: If it is caused by keloid contracture, it is normally normal and does not require special intervention. 2. Localized tissue loss or necrosis: If the skin surface is depressed due to localized tissue loss or necrosis, it is necessary to remove the necrotic tissue by reoperation and change the medication regularly. 3. Fat liquefaction: for some parts of the implant where there is more subcutaneous fat, fat liquefaction is likely to occur, and finally lead to the implant skin depression. Generally speaking, minor depressions do not require special intervention; if the depressions are deeper and affect the aesthetics, as well as other serious complications, you should consult a doctor in time and follow the doctor’s instructions.