With papular urticaria, allergen testing is usually not required. Papular urticaria, also known as insect bite dermatitis, is an allergic skin disease mainly caused by mosquito bites, and is more common in clinical aspects. Most of them occur in exposed areas, such as the head, face, hands and feet, and may also appear in the waist or buttocks. Insect bite dermatitis is mainly manifested as sudden onset of 3~10mm size pimples or mounds of herpes, usually round, after scratching or heat, the lesions will expand, and form solid masses, or even nodules, plaques, etc., accompanied by symptoms of severe itching, which seriously affects the patient’s daily life and living. Because insect bite dermatitis is mainly caused by mosquito bites caused by allergic diseases, so generally do not need to test allergens, so usually do a good job to prevent mosquitoes and insects, to avoid insect bite dermatitis, once appeared, can be used externally with glycerite lotion to achieve astringent, itching, if necessary, can be combined with oral antihistamine and topical hormone ointment treatment.