Side effects such as fever and rash can occur with desensitization treatments, where people with allergies may experience asthma, anaphylaxis, and other hazards. Desensitization therapy is used to increase tolerance to allergens by gradually increasing the dose of allergens, thereby reducing or controlling allergy symptoms. After the desensitization treatment, if you are allergic to certain drugs or auxiliary ingredients, it may cause skin fever, rash, redness, itching, etc. Most of them usually subside in about 2-3 days. The process of applying desensitization therapy in allergic people can lead to airway hyperreactivity, which may induce asthma. Rare but severe allergic reactions may lead to anaphylaxis, such as sudden drop in blood pressure, cold extremities, palpitations, chest tightness, etc. The possibility of side effects and harm induced by desensitization therapy is small, but cannot be completely ruled out. Once the above reactions occur, it is recommended to seek medical treatment promptly. And cooperate with professional doctors to carry out desensitization treatment, and should be treated promptly when the above symptoms occur.