Urticaria is a common allergic skin disease in dermatology, and the commonly used allergen testing methods mainly include patch test, laboratory test, prick test and so on. 1. Plaque test. The test substance is put in direct contact with the skin to observe whether an allergic reaction occurs. This method is simple, safe, accurate and reliable, and is often used to test the sensitizers of contact dermatitis and eczema. 2. Laboratory testing. The main test is to detect IGE, which is an antibody that mediates the type I immune response, and the test is mainly for the detection of a specific allergen. 3. Prick test. It is to use a puncture needle with allergen to pierce the skin surface, so that the allergen enters the skin directly to observe whether an allergic reaction occurs or not, and once an allergic reaction occurs, the allergen can be determined. All of the above methods should be carried out under the guidance of a doctor. Urticaria is a kind of allergic skin disease, once the allergens are determined, it is necessary to stay away from the allergens to avoid recurrence.