After the injection of hydroluminescence, the skin surface may have a small bulge is not absorbed, do not worry too much, there may be two reasons: First, the drug injection into the skin is not completely absorbed, the main component of the hydroluminescence needle is hyaluronic acid, you can add other drugs, such as placenta, autologous serum or vitamin C, etc., so as to achieve different effects. But the process of injecting the hydraluminizer into the skin will be layered, with different depths, and the degree of absorption of the hydraluminizer will be different for each person. If more medication is injected than the skin can absorb, a small bulge may be produced locally. In this case do not worry, a week or so small bulge will slowly absorbed. Second, may be in the process of injection of hydrafacial injection damage the capillaries under the dermis, a short period of time the blood may be out of the body. But the blood clotting function is very good candidates, the blood will accumulate in the subcutaneous, forming a small bulge. Over time, the bulge will slowly become smaller, and the blood will be absorbed gradually under the action of microcirculation, so there is no need to worry.