Common cosmetic injections include hyaluronic acid, whitening injections, etc. Any surgery has its corresponding risks, and beauty needles are no exception, but the side effects are relatively small. If you use regular state-approved drugs, in regular medical institutions, medical beauty institutions, and choose regular doctors for injections, it is relatively safe. If you buy drugs on your own or visit illegal beauty institutions, choose non-professional medical staff to operate, the side effects produced more, can cause local skin necrosis, darkening, while can be on the face can leave permanent scars. In addition, within 24 hours after the cosmetic injection, do not wash your face, skin care, to avoid wound infection, pus and other performance. Injections within 1-2 days, the wound may appear red and swollen, is a normal phenomenon, if a long time does not subside, you need to promptly ask the doctor, the doctor to diagnose. It is recommended that when injecting cosmetic needles, you need to choose a regular medical beauty institution, medical beauty clinic or a regular hospital, by a regular doctor to carry out the injection operation. You should also take into account the safety of the injected drugs, you need to buy drugs in the regular channels, not because of the momentary cheap choice of false products, so as not to produce adverse effects.