Papulosquamous urticaria is also known as insect bite dermatitis. It is generally considered to be an allergic skin disease caused by insect bites on the skin. It may also be related to digestive disorders, certain foods, drugs and endocrine disorders. Clinical manifestations: 1, age: most commonly seen in infants and children, adults can also occur; 2, season: most likely in spring, summer and autumn; 3, site: most likely on the extensor side of the limbs, buttocks and trunk; 4, rash: green bean to peanut grain size, fusiform red windbag-like or papule-like damage, the center may have blisters, individual can form a large tension blister; also some rice-grain size papules, rubbing stimulation is windbag-like The lesions are scattered or clustered; 5. Characteristics: accompanied by paroxysmal itching, which can affect sleep at night; 6. Prognosis: individual lesions can subside in about 1 week, scratching can cause secondary infection. Leave temporary pigmentation, if the cause can not be removed, there can be new damage re-emerging. Health education: Avoid triggering factors, pay attention to personal life and environmental hygiene, change and dry clothes and blankets regularly, try not to keep and touch pets, go to dark and humid places with many flowers and plants as little as possible, avoid mites, fleas, mosquitoes and other arthropod bites and eat suspected allergenic food (fish, shrimp, crab, beef and mutton, etc.), and eat less spicy and stimulating food. Treatment: 1, local treatment: topical anti-inflammatory, antipruritic agents, such as glutamate lotion, glucocorticoid preparations such as hydrocortisone butyrate ointment, mometasone furoate ointment, etc.; if the lesion scratching and secondary infection need to be topical antibiotic ointment, such as Bactrim, etc., the infection can be serious application of antibiotic drug therapy; for those who have large blisters, can first use a sterile syringe to aspirate the herpes fluid before using Bactrim and other anti-inflammatory cream to prevent infection The anti-inflammatory cream can be used to prevent infection. 2, with systemic symptoms can be taken orally second-generation antihistamines, such as cetirizine, loratadine syrup, etc.; severe itching at night affects sleep, can be taken orally before bedtime first-generation antihistamines, such as chlorpheniramine, ketotifen, cyproheptadine, etc.. If the symptoms are severe and the above medication is not effective, short-term oral or sedative hormone therapy may be used.