Papular urticaria, also known as acute simple itchy rash, is a bright red papular skin disease that occurs in infants and children. Etiology Most cases are associated with insect bites, which are a form of allergic reaction to the bite of fleas, lice, mites, mosquitoes, and bedbugs. The saliva injected into the skin during insect bites may be the source of sensitization, and multiple bites can produce tolerance and desensitization, so the disease can be reduced with age, and the disease can stop after school age. Clinical manifestations The disease is common in infants and children, especially in children, most common in summer and autumn, most often on the waist, buttocks and extensor side of the limbs, the basic damage is fusiform bright red lesions, the long axis of the spindle is more parallel to the skin lines, there are often small blisters in the center, some appear pseudofoot, often occur in batches, the number is variable, more clustered or striped distribution, less fusion, erythema and edema often in a short time to subside, some In some cases, on the basis of edema and erythema, large blisters soon appear, high tension, hemispherical, such lesions are mostly seen in infants and young children, itchy, after scratching epidermal peeling or blisters scratched to form a crust, the rash fades leaving a line brown pigmentation, the disease period of 7-10 days, can be secondary to infection, the disease decreases year by year. Finally no morbidity. Diagnosis The diagnosis is not difficult based on fusiform bright red lesions on the waist, buttocks and extremities of children with intense pruritus and no systemic symptoms. Treatment Treatment is mainly symptomatic and anti-allergic treatment, antihistamine preparations, vitamin C, etc. can be given, local topical anti-itch lotion, Wuji cream, can also use corticosteroid cream, the effect is obvious. If secondary infection can be topical anti-itch lotion containing antibacterial drugs, if necessary, add antibiotics, the important thing is prevention, to maintain hygiene, kill pests, pay attention to prevent insect bites, exclude allergenic food, etc.