Rash urticaria generally refers to insect bite dermatitis, which is a localized allergic inflammation caused by venom entering the skin after mosquito bites, and the treatment includes general treatment, topical medication and oral medication. 1. General treatment: after being bitten by insects, you can use soapy water and flowing water to wash the bitten area, try to clean off the venom left by insects, pay attention to the protection to avoid biting again. 2. Topical medication: If the symptoms of insect bites are mild, the lesions will disappear in a few days. If the itching is more serious, you can apply peppermint glycerite lotion, hydrocortisone cream and so on. 3. Oral medication: If the effect of treatment through the above methods is not good, the itching is particularly serious, you can take oral cetirizine, loratadine, etc., or short-term oral hormone therapy such as prednisone, can shorten the course of the disease, improve the efficacy of treatment. If you have papular urticaria, you need to go to the hospital as soon as possible, by the doctor according to the specific conditions, to develop individualized diagnosis and treatment plan, so as not to delay the condition. All of the above drugs should be used in accordance with medical advice.