Bags as big as mosquito bites on the body may be papular urticaria, which can be localized by applying antipruritic agents, glucocorticoid ointments, antibiotic ointments and so on. Papular urticaria is an allergic skin disease that occurs after insect bites, commonly fleas, mosquitoes, mites, lice, etc. It is manifested by the appearance of 3-10mm-sized papules or mounds of herpes on the surface of the skin, accompanied by intense itching symptoms. 1. Antipruritic agents: patients with mild symptoms can use topical antipruritic agents, such as glycerite lotion, no-poison cream, cool oil, anemone, etc. 2. Glucocorticoid ointment: If the rash is not easy to subside, glucocorticoid ointment can be used externally, such as mometasone furoate cream, hydrocortisone butyrate cream and so on. 3. Antibiotic ointment: If the patient’s skin lesions are broken and infected, antibiotic ointment can be used externally, such as erythromycin ointment and mupirocin ointment. All of the above drugs need to be used under the guidance of a professional doctor to avoid self-medication. If the patient’s symptoms are severe, such as severe itching and severe edema of the local skin, it is recommended to go to the hospital in time for treatment.