Tear trough is generated by the atrophy and sagging of the soft tissue at the lower edge of the orbital septum, and once it appears, it cannot be eliminated by itself. 2.Local bruising: Hyaluronic acid filling tear trough needs to rely on the syringe, if the operation process pierces the blood vessels around the eye, it will cause bruising; 3.Hard knots: the skin around the eye area is thin and loose, more difficult to handle, fat filling too shallow may appear local unevenness, you can also touch the small hard knots, therefore, the symptoms can be improved, do not over-inject; 4.Hyaluronic acid filling tear trough is most likely to occur. Hyaluronic acid filling tear trough is the most likely to occur, and the most serious complication is vascular tethering, hyaluronic acid injection into the blood vessels will block the local blood vessels, so that the skin of the vascular oxygen supply parts necrosis; if injected into the ophthalmic artery, serious cases can be immediately blind, if cerebrovascular embolism occurs, there may be brain infarction or even life-threatening. Therefore, beauty seekers should choose a regular hospital and experienced professional doctors to accurately grasp the injection site and drug dosage to ensure the safety of the injection in order to achieve good microplastic results.