Hyaluronic acid, also known as hyaluronic acid, is also found in the human body, and can be used for hydration and skin rejuvenation, facial contouring, filling in wrinkles, and so on, which can be used in a wide range of ways. However, even if it is safe to inject into the human body, there may be adverse reactions. Next, we will talk about the solution of “adverse reaction after hyaluronic acid injection”. Due to the time constraints, we will mainly focus on hard nodules or bumps, and delayed hematomas. Hardness or unevenness Hardness or unevenness is a common adverse reaction after hyaluronic acid injection. Early in the first 3 weeks of this situation, can be improved through the massage method. For example, if there is a slight bulge here in the tear trough, you can use your index finger to press this mass toward your periosteal orbital bone, and then press and rub afterward. Most of it can be pressed and rubbed away in the first 3 weeks. If after 3 weeks to a month, there are still hard nodules, it is recommended that you do a dissolution. Second, delayed hematoma Delayed hematoma, this is the second more common adverse reaction. That is, one month after the injection, the hyaluronic acid chin area suddenly swollen, like just after the hyaluronic acid kind of swelling, pain. Why does this happen? For now, there are two more confirmed statements. 1. Allergic reaction. That is to say you may have an allergic reaction to the hyaluronic acid that you put in, or to the cross-linking agent of hyaluronic acid. 2, Biofilm reaction. What is biofilm? It is a glycoprotein membrane formed by bacteria widely found in nature that work hand in hand to survive. It prevents antibiotics from getting inside the membrane to kill the bacteria. When your resistance drops, such as when you drink alcohol or have your period, the bacteria become active all of a sudden, and delayed edema occurs in this case. When delayed edema occurs, you should not panic, and the following is how to deal with it at home by yourself and after contacting your doctor. (1) Take antibiotics such as cephalosporins or macrolides. (2) Take some anti-allergic drugs, such as antihistamine drugs, Keratan or some hormone drugs, take 2 days to 5 days, this time can be very good to reduce the allergic reaction. People should not talk about hormones so allergic, if you take 2 to 5 days, there will be no such side effects as excessive obesity. (3) After it slowly subsides, during its resting period, you need to find a doctor. After two episodes of delayed redness, your doctor will recommend dissolving it. There is also a supernumerary treatment, which is when your hyaluronic acid is slowly metabolized, you won’t have such symptoms anymore.