After playing hyaluronic acid swelling period has about a week, the specific time varies from person to person, and personal constitution, daily care and other factors. Clinical hyaluronic acid injection currently has two kinds of hyaluronic acid, one is water light injection of hyaluronic acid, the injection level for the dermis and subdermal; the other is filler large molecule hyaluronic acid, crosslinking agent connecting the formation of single molecule hyaluronic acid, which can be used for volume filling in the forehead, apple muscle, the back of the nose or the chin. Usually there will be localized swelling after hyaluronic acid injection, which can be relieved in a week or so. The general swelling period of hyaluronic acid injection is about 3 days, and can return to normal in more than 1 week. If improper care or allergy occurs after hydrogel injection, the swelling period will be a little longer, at this time should be under the guidance of specialists in aseptic ice packs or oral antihistamine treatment; if the temples, forehead and other parts of the filler injection hematoma, infection and other anomalies, the swelling period will be longer, at this time it is recommended that the patient in the guidance of specialists in the compression, ice packs and anti-infection treatment. In addition, after the injection of hyaluronic acid, we should pay attention to keep clean, to avoid infection of the injection site, avoid local massage or scrub the treatment area, follow the doctor’s instructions for scientific care. Abnormal swelling as mentioned above should go to the regular medical institutions in time, so as not to delay the condition and cause adverse consequences.