Papular urticaria, also known as “acute simple itchy rash”, can gradually subside in 1-2 weeks after active treatment, but it can recur, and the specific time of improvement depends on the individual’s constitution, environment, severity of the disease, treatment plan and other factors, and cannot be generalized. Papular urticaria, related to insect bites, intestinal parasites and certain food allergies, is commonly seen in children and adolescents, mostly in the spring, summer and autumn and other warm seasons, most often in the waist, back, abdomen, limbs and other parts. The lesion is a red papule, 1-2 cm in diameter, round or oval, often with blisters in the center, more clustered distribution, rarely fused, itching and repeated scratching can be secondary to infection, usually 1-2 weeks or so the rash can gradually subside. If the rash is not treated with medication in time and the cause persists, it will recur and last for a long time. It is recommended that when papular urticaria appears, you should consult a dermatologist in a timely manner and, under the guidance of a doctor, use oral or topical medications according to your condition. At the same time, try to get rid of various causative factors, such as insect bites, local irritation, gastrointestinal dysfunction, etc. In daily life, pay attention to environmental and personal hygiene, eliminate mosquitoes and insects in a timely manner, go less often to places with many flowers and trees, and avoid suspicious food to prevent recurrent attacks of papular urticaria.