It takes about 7 days for the bruising to disappear after hydroxy injection. Bruising is caused by the needle damaging the dermis and the rich vascular network under the skin, and is usually seen in the periorbital and perioral areas where blood flow is rich. If the bruise does not aggravate further, patients do not need to worry too much, usually after 7 days or so, it will subside on its own. Within 48 hours after the injection, patients are advised to apply ice packs to the bruised area to reduce the increase of subcutaneous ecchymosis, and after 48 hours, hot compresses are recommended to promote the dissipation of the bruise. If the bruise appears further aggravation or obvious discomfort symptoms, it is recommended to go to the hospital in time for treatment. In order to avoid skin bruising after hyaluronic acid injection, it is recommended that patients go to regular medical institutions, under the operation of professionally qualified doctors.