How long it takes for the swelling to go down after hyaluronic acid injection varies depending on the patient’s body type, and the swelling usually goes down after 2-3 days, usually not more than a week. Hyaluronic acid injection has the advantages of small invasion, small risk and fast results, which is a more popular minimally invasive plastic surgery project today. However, after the injection of broken uric acid, some patients may have a period of swelling, and individual patients may even experience local redness from the injection. In general, the swelling period lasts for about 2-3 days, after which it will improve or even disappear, and even for patients with poor skin quality, it usually recovers completely within a week. If there is still obvious swelling or even other discomfort in the injected area after a week, it is recommended to go to the dermatology or plastic surgery department of a regular hospital in time to clarify the specific situation and take targeted treatment. After hyaluronic acid injection, if swelling occurs, patients can apply appropriate cold compresses to assist in reducing swelling. It is advisable to eat a light diet on weekdays and avoid spicy and stimulating foods.