Hyaluronic acid filling tear trough may lead to local redness, swelling, bruising, unevenness, infection and other side effects, which can usually subside, or may lead to serious sequelae such as embolism, but it is rare. 1. Redness, swelling and bruising: Hyaluronic acid’s water absorption leads to local swelling after surgery, especially the loose subcutaneous tissue around the eyes, it is more likely to appear edema; injection damage to the capillaries around the eyes will lead to subcutaneous bruising, and bruising around the eyes, these are normal physiological phenomena, usually a few days after the gradual subsidence of the need for special treatment, you can apply ice packs locally if necessary. 2. Unevenness: it may be related to the shallow injection level, uneven injection of hyaluronic acid, poor post refractive care and other factors, you need to consult a doctor in a timely manner, by the doctor to deal with the symptoms. 3. Infection: The presence of infected lesions in the skin at the tear trough before surgery, unstrict sterilization of the surgical site, non-standardized surgery, poor postoperative care and other factors may lead to postoperative infection, redness, swelling, pain, fever and other symptoms, which require timely medical attention to avoid delay. 4. Embolism: If hyaluronic acid is injected into blood vessels, it will block local blood vessels and lead to skin necrosis in the area of vascular oxygen supply; if hyaluronic acid is inadvertently injected into the ophthalmic artery, it will lead to blindness. Pregnant and breastfeeding women, people with abnormal coagulation function, people with infections in the nasolacrimal duct area, patients with psychological disorders or mental anomalies can not undergo hyaluronic acid filling tear trough treatment. It is recommended that people who need to undergo hyaluronic acid tear trough filling treatment should visit regular hospitals and choose the best treatment plan under the guidance of doctors, so as to reduce the incidence of postoperative side effects and achieve ideal results.