The whitening injection technique is to inject some antioxidant ingredients into the body in the form of intravenous drip to improve skin texture, lighten melanin and whiten the skin. The whitening injection has no obvious toxic side effects within a certain dosage, which is safer and more reliable, but improper injection or long-term injection may cause the following risks: 1. Bruising or hematoma: In the process of injecting the whitening injection into the vein, the vein may be punctured, so that localized bruises or hematomas; 2. Allergic reaction: The main ingredient of whitening injections is a mixture of various whitening medications. In the process of injecting the drugs into the vein, a very small number of people will have an allergic reaction to one or more of the drugs. In mild cases, the local skin may become red, rash, and painful, and in severe cases, shock and death may occur; 3, nausea and vomiting: too fast and too much infusion in a short period of time will aggravate the burden on the heart, speed up the heart rate, and nausea and vomiting; 4, other: long-term intravenous injection may cause endovascular damage, phlebitis, phlebitis, infection and other complications, and will also aggravate the burden on the cardiovascular system, causing kidney and liver injury.