Recently, many parents have found red bumps or papules on their children’s bodies, some with blisters on top, itchy and always bad over and over again, in fact, their children are suffering from pediatric papular urticaria, also known as infantile moss. Papular urticaria is a common allergic skin disease in infants and children. It often develops in the spring, summer and fall. As the weather warms up in the spring, many insects become active and children with allergic tendencies can become ill. Papular urticaria tends to occur on the trunk and extremities, but the head and face are less commonly affected. The lesions appear as papules or blisters. The itch is severe, especially at night, and often affects the sleep of the child, who is mentally disturbed. The epidermis peels off after scratching, which can easily lead to secondary infection, but there are usually no systemic symptoms and the local superficial lymph nodes are not enlarged. The course of the disease is about 1 to 2 weeks, after the damage subsides, temporary pigmentation spots may remain, but it is easy to recur, and new rashes can appear one after another, until the weather turns cool and gradually healed. The main treatment is local symptomatic treatment, according to the performance of the lesions, can choose with anti-itch, anti-inflammatory effect of the lotion or emulsion external application. If there is secondary infection, it is appropriate to control the infection first. If the symptoms are severe or the effect of local medication is not good, systemic medication can be used, generally using drugs with both antihistamine and sedative effects, such as benadryl, fenagan, paracetamol, cyproheptadine, etc. The actual fact is that you can find a lot of people who have been in the business for a long time. Because the cause of papular urticaria is mainly insect bites, the key to prevention is to improve environmental, room and personal hygiene to eliminate the breeding of insects that cause the disease. Keep indoor air circulation, adequate ventilation and light, because mites are afraid of light, sun exposure can kill mites. Spray insecticides on beds, corners and furniture to eliminate bedbugs, fleas and mosquitoes that can spread the disease. Do not easily expose your skin to flowers and plants when you go out, especially for young women and children. Don’t take your baby to play under grass, trees or places where there are many wet mosquitoes. Should wash and dry clothes, sheets, pillows, quilts, stuffed toys. Usually use boiling water to soak and wash sheets, covers and mats, and pay particular attention to killing insects when changing mats in the heat. When the rash appears you should drink less dairy products; try to eat less eggs, fish, shrimp, crab and other high-protein foods. You should try to avoid scratching, scalding, and avoid contact with silk, wool, and fiber clothing. Because this disease is a common occurrence in children in spring and autumn, especially after outdoor activities, the rash can subside naturally as long as you pay attention to some life and diet precautions.