Papular urticaria, also known as acute prurigo simplex, is mostly caused by insect bites, commonly from arthropods such as mosquitoes, fleas, mites, and bedbugs. Some cases may be related to food allergies and digestive disorders. It predominantly affects children and adolescents and is more common in spring and autumn.

bubble_chart Clinical Manifestations

1. Conscious cutaneous pruritus, mostly severe, generally without systemic symptoms;
2. Skin lesions are commonly seen on the limbs, buttocks, and lower back, often appearing in batches, mostly scattered or clustered, and generally not merging;
3. The skin lesions are the size of soybeans to peanuts, presenting as spindle-shaped red edematous papules, with possible central papulovesicles, chickenpox, or bullae. The rash subsides after 7–10 days and may leave temporary pigmentation.

bubble_chart Diagnosis

1. More common in children, with a higher incidence in spring and autumn;
2. The skin lesions are light red spindle-shaped wheal-like papules, with possible small chickenpox in the center;
3. The skin lesions are mostly found on the limbs, buttocks, and lower back, accompanied by cutaneous pruritus. Repeated scratching may lead to secondary infections.

bubble_chart Treatment Measures

Treatment Principles

1. Oral antihistamines;
2. Appropriate selection of topical soothing and antipruritic medications;
3. Antibiotics for secondary infections.

Generally, topical medications are the primary treatment; for severe cases or those affecting sleep, one to two types of antihistamines or other medications may be used.

bubble_chart Cure Criteria

1. Cure: cutaneous pruritus disappears, rash subsides;
2. Improvement: cutaneous pruritus alleviates, no new rash appears, skin lesions improve;
3. No cure: rash continues to increase, cutaneous pruritus still persists.