1. Bleeding or hematoma: hematoma is the most common complication after debridement, manifesting as increased pain, fullness of the affected side, swelling of eyelids and lips, and ecchymosis of the buccal mucosa, etc. It is mostly caused by incomplete hemostasis during the operation or inaccurate postoperative bandaging. Preventive measures include complete hemostasis under direct vision during operation; leaving half-tube drainage or negative pressure drainage according to intraoperative bleeding; and appropriate postoperative compression bandage. Once the hematoma is diagnosed, the suture should be removed immediately for drainage, or puncture and suction with pressure bandage. 2, nerve injury: wrinkle surgery may damage the motor nerve for the facial nerve, may damage the sensory nerve for the auricular nerve, supraorbital nerve, infraorbital nerve. The common risk factors of facial nerve injury are: temporary paralysis caused by the abnormal blocking effect of local anesthetics on a nerve branch, which can be fully recovered after a few hours; dissections of small branches near the muscles of expression; permanent facial nerve paralysis caused by dissections of a nerve branch (trunk); postoperative hematoma compression or over-tightening of the bandage can also cause reversible or irreversible nerve injury. Sensory nerve injury manifests as sensory abnormalities in the corresponding area, which can mostly be compensated or recovered. Therefore, one should be familiar with the anatomical characteristics of the facial nerve and strictly follow the anatomical hierarchy of stripping. Temporary paralysis caused by anesthesia can be recovered by itself; hematoma compression caused by hematoma should be removed in time; clear damage to the main branches of the facial nerve should be immediately anastomosed during the operation. 3.Skin necrosis: If the hematoma is not treated in time, leading to infection, it may lead to skin necrosis. The skin flap is too thin, affecting the blood supply, which may also lead to skin necrosis. Excessive suture tension may cause necrosis at the edge of the incision and form obvious scar. Therefore, hematomas should be actively prevented and promptly treated. Peeling flaps are selected at the correct level with uniform thickness, and it is desirable to bring a moderate amount of subcutaneous fat. Suture tension is moderate. 4, baldness: scalp flap peeling too thin damage to the hair follicles, or application of electric knife damage to the hair follicles can lead to baldness. Excessive scalp suture tension and incision scar formation can lead to follicular degeneration. Attention should be paid to the direction of the incision to minimize follicle damage. Peeling to master the correct plane, retain a certain amount of subcutaneous fat volume. 5, incisional scar hyperplasia: incisional scar hyperplasia, mostly due to excessive incisional tension or incisional infection. Therefore, the amount of skin excision should be moderate to prevent excessive incisional tension. The incision should be sutured in layers with reduced tension. 6, parotid gland or parotid duct injury: buccal peeling injury to the parotid fascia can cause parotid fistula. Try not to cut the parotid fascia when peeling the surface of parotid fascia; pay attention to prevent damage to the parotid duct when peeling the subcutaneous part of the buccal part and under the SMAS. Bilateral asymmetry: The following factors can lead to bilateral asymmetry after surgery: bilateral asymmetry in incision design; bilateral asymmetry in the level and range of flap peeling; bilateral differences in the amount of skin tissue removed; and inconsistent degree of flap lifting during suturing. Therefore, it should be avoided in all the above aspects.