1. Keloid scarring: Risk factors for postoperative keloid scarring include poor suture technique, uneven alignment of both sides of the incision, uneven depth of both sides of the incision during needle insertion; excessive suture tension, no subcutaneous decompression suture; excessive thickness of suture; and postoperative infection. Preventive measures include strict aseptic operation and postoperative prevention of infection; application of 5-0 or 6-0 absorbable thread for subcutaneous decompression suture, and 7-0 or 8-0 nylon thread for para-suture of the skin; uniform depth of the needle, smooth surface, and no misalignment of the vertical incision direction. Those who formed scar hyperplasia should be repaired 6 months after surgery. Bleeding or hematoma: Hematoma formation is detrimental to incision healing and increases the risk of infection and scar formation. Risk factors for hemorrhage include rough intraoperative operation, excessive injury, incomplete hemostasis; injury to supraorbital blood vessels; adding too much epinephrine to local anesthetics during the operation, and rebound hemorrhage after the effect of epinephrine wears off; and inaccurate postoperative bandaging. Preventive measures include suspending anticoagulant drugs 1 week before surgery; operating gently during surgery to stop bleeding completely; avoiding strenuous exercise for 1 week after surgery; and applying appropriate postoperative compression bandage. Small hematomas do not require special treatment and can be completely absorbed. If the hematoma is obvious or continues to bleed, the incision should be opened, the hematoma should be removed, hemostasis should be carried out thoroughly, and pressure bandage should be applied. Postoperative infection: Postoperative infection risk factors include not strictly grasp the indications for surgery, surgery in the presence of local infection; not strictly abide by the aseptic operating procedures, skin, instruments, sutures, sterilization is not strict; surgical operation rough, tissue trauma and postoperative hematoma, reducing the resistance of the tissues; embedded wire exposed, incomplete removal of the thread, thread infection, and so on. Preventive measures include strict adherence to aseptic operation; no surgery when there is local infection; surgical operation should be gentle, minimize tissue damage and prevent postoperative hematoma. 4, bilateral asymmetry: preoperative bilateral brow shape or upper eyelid form asymmetry, in the design of the design is not adjusted or the design of the incision is not completely symmetrical can lead to postoperative bilateral asymmetry. Preoperative design should ensure bilateral symmetry. If there is a preoperative asymmetry in the shape of the brow or upper lid, the incision should be adjusted accordingly.