Hyaluronic acid lumps can disappear within a week if they are localized tissue edema; if they are hard lumps of hyaluronic acid left in the tissues, it will take about a month for them to slowly subside. Hyaluronic acid, also known as hyaluronic acid, is one of the main matrix components of the dermis of human skin, through the injection of hyaluronic acid can play a role in filling the wrinkles of the face as well as the phenomenon of depressions, prompting the skin to be more full and elastic. During the injection process, swelling and pain may occur at the injection site, and the edema may gradually subside within a week. However, after injecting hyaluronic acid in some patients, the body may regard hyaluronic acid as a foreign substance, thus forming a package outside the hyaluronic acid, resulting in the emergence of hard lumps, which can be gradually absorbed by the body, but the speed will be slower, and it may take a month or even several months to absorb and subside. Therefore, we should pay attention to the postoperative care work, first of all, avoid touching the injection site, keep the injection site dry and clean. If the hard lumps do not go away for a long time and there is pain and other uncomfortable symptoms, you can go to the hospital in time.