Swelling after hyaluronic acid injection may be related to local hematoma, excessive injection dose or infection, etc., which can be treated by local cold compress, hyaluronic acid dissolving enzyme injection and medication to reduce swelling. Hyaluronic acid injection is an invasive operation, most of the local mild swelling after injection is a normal physiological phenomenon, it may also be related to the loss of small blood vessels during the injection process, you can use local cold compress to reduce swelling, such as using ice packs or wet towels for the swollen parts of the cold compress, but the time should not be too long, to avoid frostbite skin. If swelling persists for a longer period of time after hyaluronic acid injection, it is considered to be related to excessive or uneven injection of hyaluronic acid, and the appearance can be improved by local injection of dissolving enzyme. If the swelling after hyaluronic acid injection continues to worsen and there are signs of infection such as redness, heat, pain, etc., anti-inflammatory drugs can be taken as prescribed by the doctor to reduce swelling. Common medications include amoxicillin capsules and metronidazole. When the swelling is serious, surgical incision and drainage or placement of drainage tubes are also required. If there is localized swelling after hyaluronic acid injection, you should go to a regular medical institution in time, do not take medication without authorization, so as not to delay the condition.