Cold and hot urticaria are commonly referred to as hot contact urticaria (heat urticaria) and cold contact urticaria (cold urticaria). Contact urticaria is a condition in which the skin is exposed to certain allergens and develops symptoms such as redness, puffiness and itching. Cold and hot contact urticaria usually manifest as the above symptoms when encountering a heat or cold source, and the treatment is based on the following two conditions: I. Cold contact urticaria: 1. General treatment: avoid continuing to be in a cold environment, pay attention to keeping warm, try not to touch cold water or eat cold food, do not scratch the affected skin to avoid aggravating the condition or causing skin breakdown and infection, try to wear cotton or silk The skin of the affected area should not be scratched to avoid aggravation or skin breakdown and infection. If the disease worsens, glucocorticoids, such as prednisone, can be used, but should not be used for a long time. Vitamin C, vitamin P and calcium can also be chosen as adjunctive therapy. If there are itching symptoms, you can use topical glycolite lotion or zinc oxide lotion, both of which can temporarily relieve itching symptoms; 3. Desensitization therapy: cold water adaptive desensitization therapy is usually applied, cold desensitization by repeated cold baths, which can lower the temperature threshold and relieve cold-induced symptoms, mainly for people with poor efficacy of medication, and generally requires hospitalization and simultaneous oral antihistamine treatment. Second, hot contact urticaria: compared to cold contact urticaria, hot contact urticaria occurs less often, mainly related to allergies, scratching irritation, sun exposure or heat, avoid contact with overheated environments, heat sources, such as hot water, stoves, etc., but also to avoid mental stimulation. The choice of medication is the same as for cold contact urticaria, and desensitization treatment can also be performed symptomatically. There is no clear method to eradicate cold and hot contact urticaria, but only symptomatic treatment. Therefore, you need to avoid prolonged contact with cold and hot sources in your life, and cooperate with medication and desensitization to relieve symptoms.