Hyaluronic acid injections have become a regular part of the micropigmentation industry, from skin care to facial contouring, hyaluronic acid has its appropriate role. However, there are risks and complications associated with any procedure, and even with legal drugs, there are certain side effects. In the case of hyaluronic acid, the following side effects may occur after performing facial injections: 1. Over-injection may lead to significant facial swelling, stiff expressions and unevenness. The mystery of hyaluronic acid is fine tuning, and the right amount of injection can bring a very natural look and feel. Professional doctors will master the injection level and match different molecules of hyaluronic acid for injection to obtain good surgical results; 2.If you choose an unprofessional and unqualified doctor for injection, you may touch the facial nerves and blood vessels during the injection process, causing embolism and facial paralysis, which may also lead to blindness or even death in serious cases; 3.After injection, redness, swelling, heat, pain and swelling may occur. Most of them can gradually subside with time, but if they do not subside for a long time, you should go to the hospital for examination and treatment. When injecting hyaluronic acid, beauty seekers must keep in mind the principle of appropriate amount and choose a regular institution as well as a professional doctor, which can greatly reduce the risk of injection.