There are 8 possible complications of eyelid surgery: lower lid ectropion, bleeding or hematoma, tearing, lower lid depression, incision scar exposure or hyperplasia, bilateral asymmetry, infection, corneal injury, etc. 1. Lower lid ectropion: If too much skin or orbicularis muscle is removed or if an infected scar forms at the incision and pulls the lower lid, this will result in lower lid ectropion. Mild lower face ectropion can also occur after surgery in older adults with relaxed orbicularis oculi and reduced lid elasticity. Male patients with dense skin and someone with lax orbicularis oculi and reduced lid elasticity are also at risk for mild lower face ectropion after surgery. Male patients with dense skin have the potential for temporary lower lid ectropion that disappears after about 1 month. Preventive measures for lower lid ectropion include precise and delicate intraoperative manipulation and mastering the amount of skin and muscle removed, with the principle of preferring less to more and aiming for moderation. Lower lid ectropion and lid ball separation are difficult postoperative complications. In the case of lower lid ectropion and lid ball separation, do not rush to operate again. In mild cases, local hot compresses, physical therapy, massage, etc. can be applied and the swelling will subside. For irreversible lower eyelid ectropion and lid ball separation, conservative treatment for 3 to 6 months should be followed by appropriate surgery. 2. Bleeding or hematoma: Subcutaneous bruising and subconjunctival bleeding are mostly caused by bleeding into the subcutis and subconjunctiva due to deep anesthetic injection, puncture of blood vessels, rough surgical operation or incomplete intraoperative hemostasis. A more serious complication of oophorectomy is post-bulbar or intraorbital hemorrhage, and special attention should be paid when dealing with orbital septum fat. Preventive measures include suspension of anticoagulant drugs 1 week before surgery; gentle operation during surgery to stop bleeding completely; and avoiding strenuous exercise for 1 week after surgery. Subcutaneous bruising, small hematoma and subconjunctival bleeding generally do not require special treatment, and ice packs are feasible within 72 hours after surgery, and hot packs can be applied after 72 hours if there is no more bleeding to promote natural absorption. Larger hematomas or those who continue to bleed should promptly open the incision and remove the hematoma. More bleeding after the ball can lead to blindness, so once it happens, the sutures should be removed, the orbital septum should be opened, the accumulated blood should be cleared, and the bleeding point should be found and ligated to stop the bleeding. 3. Tear overflow: Postoperative ectropion of the lower lid occurs, the lid bulb separates, and the lower tear dots lose their normal attachment, which can lead to tear overflow symptoms. If the skin incision is too close to the lower lacrimal dots, postoperative local scar traction and deviation of the lacrimal dots from their normal attachment position can also lead to tearing. Injury to the inferior lacrimal duct or the inferior lacrimal duct is also a cause. For the reasons of tear overflow, the focus should be on prevention of related complications, and surgical operation should be rigorous, precise and delicate to avoid accidental injury. Once the tear dots are displaced and deviate from their normal attachment position, they should be treated according to different reasons, and if surgical repair is needed, it should be performed 3-6 months after surgery. Injury to the lacrimal dots or tear ducts should be treated with the assistance of an ophthalmologist. 4. Lower lid depression: This is mainly due to excessive removal of fat from the orbital septum and can also be caused by postoperative adhesions between the skin, muscles, orbital septum and deeper tissues. The preventive measures are to control the amount of septal fat removed during surgery and to replant the cut fat back if there is significant sunkenness in the eyelid. In particular, it is important not to blindly pull the septal fat outward or to cut deeper at will. Once this occurs, it is not necessary to correct the problem in mild cases, but in severe cases, free fat or dermal fat grafting is used to fill the area 3 to 6 months after surgery. 5. Incisional scar exposure or hyperplasia: Risk factors that may lead to significant postoperative incisions include: too low an incision design under the lid margin or an incision that is too long beyond the outer canthus; poor suture technique with uneven alignment on both sides of the incision during needle feeding; uneven depth on both sides of the incision during needle feeding; overly thick sutures; excessive skin removal and high incisional tension during suturing; and postoperative incisional infection. Preventive measures should emphasize the proper location of the incision design, with 1.0 to 1.5 mm from the root of the lowermost row of lashes on the lower lid. The incision should be sutured with an even depth of needle entry, a flat surface, and no misalignment in the vertical incision direction. The amount of skin removed during surgery should be controlled to prevent excessive tension in the incision. After the stitches are removed, anti-scarring drugs can be applied to the incision as appropriate. If the scar is obvious, the lower lid can be surgically repaired 6 months after surgery if the skin relaxation allows. 6. Bilateral asymmetry: Bilateral asymmetry in preoperative design, asymmetry in the amount of tissue removed during surgery, and differences in the degree of skin laxity and orbital fat bulging between the two sides of the eyebags before surgery may lead to bilateral asymmetry after surgery. Preventive measures are to carefully observe the eye bags before surgery, and handle the skin, muscle, septal fat and other tissues as appropriate during surgery. If the incision is asymmetrical and the postoperative incision scar is not obvious, there is no need to deal with it. If there is obvious bilateral asymmetry, surgical correction will be performed after 3-6 months after surgery. 7. Infection: Risk factors include not strictly grasping the indications for surgery and performing surgery in the presence of ocular infection; not strictly complying with aseptic operation protocols, poor disinfection of skin, instruments and sutures; rough surgical operation, tissue trauma and postoperative hematoma, which reduces the resistance of tissues; exposed buried threads, incomplete stitch removal and thread infection. Preventive measures include strict adherence to aseptic operation, no surgery when the eye is infected, and gentle surgical manipulation to minimize tissue damage and prevent postoperative hematoma. The eyelids are rich in blood flow and resistant to infection, so infection is generally rare. If infection occurs, it should be treated promptly or the postoperative result will be affected. 8. Corneal injury: Mostly occurs during transconjunctival incision surgery, where the cornea is accidentally injured by inadvertent intraoperative manipulation or poor corneal protection. Intraoperative eyelid retraction, corneal exposure for too long, dry, also easy to cause corneal injury. Special attention should be paid to protecting the cornea during surgery to prevent accidental corneal injury or corneal dryness. Once the patient has symptoms of photophobia, lacrimation, pain and other irritation after surgery, and corneal injury is suspected, he or she should promptly seek the assistance of an ophthalmologist for treatment.