There may be a small bulge on the surface of the skin after a hydrafacial injection, which usually absorbs and fades away slowly in about 1 week. The appearance of small bulges on the surface of the skin after hydrating injections may be due to the fact that the medication injected into the subcutaneous is not completely absorbed. The main component of the hydrafacial injection is hyaluronic acid, and other drugs can be added during the injection, such as placenta, autologous serum or vitamin C. If the injected drug is more than the skin’s ability to absorb, it may produce a small bulge in the local area, which will generally subside slowly in about 1 week. In addition, if the water light injection process damage the capillaries under the dermis, causing a small amount of bleeding to form a small bulge, over time, will also slowly become smaller and gradually absorbed, the beauty seekers do not need to worry too much. After the hydrafacial injection within 24 hours need to keep the wound clean and dry, do not get wet, so as not to cause wound infection.