Hyaluronic acid, also known as hyaluronic acid, is a substance that exists in the human body itself and has strong water-locking properties. When you are young, your skin is smooth and elastic because it is rich in hyaluronic acid, but as you age, the hyaluronic acid in your body will gradually be lost, and wrinkles and other aging phenomena will appear one after another. Therefore, many beauty lovers take care of their skin by injecting hyaluronic acid and other methods, which are generally not harmful to the human body, with very little irritation to the skin and few allergic reactions. However, if the candidate himself suffers from autoimmune diseases, such as lupus erythematosus and rheumatic or rheumatoid inflammation, it may cause allergic reactions and damage to the skin. Skin irritation from hyaluronic acid is more common when other substances are mixed within the hyaluronic acid. Because hyaluronic acid has the function of promoting the absorption of nutrients, many businesses will be mixed with other whitening skin care substances, and some people will be allergic to these substances, resulting in skin irritation. In addition, the injection is not hyaluronic acid at all, but other substances. The most common one is OMT, which is similar to hyaluronic acid and is latent, so it is not easy to be detected, and the cost is lower than hyaluronic acid. Therefore, it is recommended that beauty lovers go to regular medical beauty institutions for hyaluronic acid injections and seek medical treatment as soon as possible once skin abnormalities occur.