Hyaluronic acid is a beauty injection certified by the US Food and Drug Administration in China, which belongs to the category of medical device management. Medically speaking, injection of hyaluronic acid is safe, so the human body will also produce hyaluronic acid, but with the growth of age, the speed of hyaluronic acid production is far behind the speed of hyaluronic acid loss. Hyaluronic acid injection has dosage requirements according to individual circumstances. Too much or too much will have certain side effects. Excessive injection of hyaluronic acid can lead to infection, swelling, tight skin, stiff and unnatural expression, or uneven skin surface. The more hyaluronic acid is used, the greater the chance of damaging blood vessels and nerves. That's why some people will be blind or face paralysis because of a needle. In addition to the wrong injection site, the dose is too large and the model may be wrong.