The most important concern of many microplastic surgery friends is that what if the body does not adapt to what is injected into the body? Although most of the drugs commonly used for microplastic injections come from substances that are already in the body itself, it is not strict to say that 100% of them will not have allergies. What if someone is allergic to the injected agent? I. What is dermal filler? Dermal fillers are gel-like substances that can be injected intradermally or subcutaneously, mainly used to repair facial or body surface depressions and deformities, aging facial depressions or static wrinkles, in addition to beautifying the features and adjusting the contours of the face or body. Second, what are the types of injectable fillers? According to the source of classification can be broadly divided into animal sources, human tissue sources and synthetic three categories. Although injectable fillers are strictly screened and prepared, usually the material and human tissue blend better and allergic reactions are rare. However, when certain materials containing or having antigenic substances are injected, or when the injected object is more sensitive to a certain material, local allergic reactions will occur. In addition, the distribution channels in the market are now more complicated, and there are many products that flow into the plastic surgery market in an informal way, therefore, allergies also occur. In extreme cases, serious allergic reactions can occur, such as anaphylaxis, which can even be life-threatening. Therefore, allergy is one of the problems that cannot be ignored in the field of cosmetic injections. Third, why do people have allergies? Injection allergy is mostly a type I allergic reaction, which usually manifests as a rash. This is a more complex reaction, and this allergic state can be maintained for six months to several years, and will gradually disappear later if there is no stimulation by the same antigen. When the same antigen (such as the injected material) enters the body again, it will lead to smooth muscle spasm, capillary dilation, increased vascular permeability and other reactions, causing a rash, skin flushing, gastrointestinal discomfort and respiratory distress. What will be the reaction of allergy? Allergies caused by injected materials are usually localized and relatively mild. It is mostly manifested as swelling, redness or rash of the skin near the injection area; for severe allergy, it is manifested as shock, hypotension, respiratory distress, laryngeal edema, generalized urticaria, etc.. However, such cases are extremely rare. V. What should I do if I have allergies? At present, the treatment of skin allergy is still at the stage of conservative treatment. Frankly speaking, there is no particularly effective medical solution for allergy. –3, with abdominal pain, diarrhea and other gastrointestinal reactions – antispasmodic analgesics, atropine, 4, with respiratory symptoms – anticholinergic drugs, etc.; for Relatively serious patients, or the acute phase of the onset of the disease can be given glucocorticoids oral or intravenous; for serious cases need to follow the steps of anaphylaxis rescue treatment. Sixth, what do people with allergies need to pay attention to? Once an allergic reaction has occurred and has recurred, you need to pay attention to your diet and living habits before getting rid of the allergen completely: eat a light diet, avoid greasy and spicy food, stay away from smoking and alcohol, and avoid overheated environments. Some people say how they can’t remember what to do? Then please remember one, the food and environment that can make you blush, you should try to stay away! It is also important not to touch the substance that makes you allergic again, for example, people who are allergic to hyaluronic acid should not try to inject it repeatedly.