The first symptom of allergy is allergic dermatitis, if the local contact with the allergic substances, there will be redness, itching, swelling and so on, and in severe cases, you can see localized maculopapular rash, or hives like a hive, etc. If the symptoms spread to the whole body, there will be a generalized hives. If the symptoms are more severe and spread to the whole body, a generalized hives-like rash may appear, with itching as the main symptom. Secondly, if the allergy affects the larynx and lungs, resulting in laryngeal edema or pulmonary edema, shortness of breath, dyspnea, or even severe cyanosis of the lips or the whole body may occur. If it is the most serious symptoms of anaphylaxis, there will be a deterioration of the state of consciousness, or even a blurred consciousness, coma, and a decrease in blood pressure.