Hi-Body, a brand of hyaluronic acid. Improper injection of hyaluronic acid may cause side effects such as tissue embolism, bleeding, and localized infection. Currently, hyaluronic acid can be used clinically to fill in facial depressions, face and neck wrinkles, and so on. Hyaluronic acid injection is an invasive operation, and the injection process has the risk of damaging local blood vessels, causing bruising or deep hematoma. If the injection process is not done properly, the injection into the blood vessels will cause tissue embolism. In the process of hyaluronic acid injection, if the aseptic operation is not proper or sterilization is not tight, it may also cause local infection of the tissue. The injection of hyaluronic acid requires a high level of professional and technical skills of the operator, and patients who are willing to be treated should choose regular medical beauty institutions and standardize the treatment under the guidance of specialists, so as to avoid adverse consequences.