Papular urticaria is a common summer skin disease, mostly related to insect bites, which occurs in infants and children, but can also occur in adults. The main manifestations of papular urticaria: scattered green bean to peanut-sized, slightly fusiform red lesions on the trunk and extremities, some may have pseudopods, often with small blisters at the top; some occur and then become large hemispherical elevated tense blisters, no surrounding redness; others are harder corn-sized papules, scratching after the wind swelling. The old and new rashes often coexist, and the rash is itchy and often causes secondary infections due to scratching. The rash may fade on its own after 1 to 2 weeks, leaving temporary hyperpigmentation, but is often prone to recurrence. There are usually no systemic symptoms, and the local lymph nodes are not enlarged. Treatment of papular urticaria is mainly preventive, anti-allergic, anti-itch, avoid scratching, and prevent secondary infection. For those with severe itching, oral antihistamines such as cycloheximide hydrochloride, paracetamol or cetirizine hydrochloride can be given under the guidance of a doctor (choose one). Topical treatment can be given as 1% peppermint glycolic lotion or topical corticosteroid preparations for external application. Secondary infections can be treated with oral antibiotics and topical Bactrim ointment. To prevent papular urticaria, the main thing is to pay attention to environmental hygiene, eliminate bedbugs, fleas, lice, mosquitoes, mites, etc., not to keep pets, keep the skin clean and hygienic, avoid the intake of suspicious food, and actively treat gastrointestinal diseases and intestinal parasitic diseases. It is worth mentioning that infants and children with papular urticaria are very prone to streptococcal infections due to constant scratching. Therefore, it is important to try to stop children from scratching and to seek timely treatment at a hospital dermatology department.