Tear trough is a groove that appears on the lower eyelid near the nose starting from the inner corner of the eye and is created by atrophy and sagging of the soft tissue at the lower edge of the orbital septum. Tear troughs are usually congenital and often more pronounced in people with thinner skin under the eyes than in the general population. Hyaluronic acid injections are one of the effective ways to solve tear trough hollows, but hyaluronic acid injections are very demanding for doctors to operate. Because the skin around our eyes is very thin, a little carelessness can easily over-inject or cause local unevenness. If the blood vessels around the eyes are accidentally punctured, it can also cause bruising. Therefore, you should choose a regular hospital and an experienced professional doctor for this operation, and precisely grasp the injection site and drug dosage in order to ensure safety and achieve good micro-refinement results. After hyaluronic acid filler tear trough may appear local swelling, bruising and other phenomena, do not worry too much, these are normal phenomena. Generally, no special treatment is needed. The redness and swelling will generally subside in about 3 days, while the bruising will take about 1 week to subside. After hyaluronic acid injection, hyaluronic acid will be gradually absorbed with the body’s metabolism, so it needs to be injected several times, and one injection can generally last for about 6 months. In addition, it should be noted that the use of blood-activating drugs should be suspended after hyaluronic acid for tear trough filling; do not do sauna and massage within a week after surgery to avoid bleeding and infection caused by microvascular rupture; avoid spicy food, quit smoking and alcohol; pay attention to rest and do not do strenuous exercise.