Hyaluronic acid, also known as hyaluronic acid and uronic acid, is a substance existing in human body. At present, it is widely used in the beauty industry, and has a good effect on skin moisturizing and beauty beauty. Its effects include wrinkle removal, lip augmentation and face filling. Hyaluronic acid can be quickly fused with its own hyaluronic acid after being injected into the human body through a pinhole, so it is very safe. However, it is prohibited for people who have a serious reaction to hyaluronic acid derivatives, pregnant women or lactating women, and during taking anticoagulant drugs. Therefore, before using hyaluronic acid, you must choose a regular hospital, do a good job of examination, and follow the doctor's advice according to your own situation. Hyaluronic acid has few side effects, but nothing is perfect for 100%. The common adverse reactions after hyaluronic acid injection are local redness, darkening and mild pain, which generally do not need special treatment and can be relieved by themselves within 3 days.