Papular urticaria is common in infants and children, and is common in summer and fall. The disease is mostly associated with insect bites, so it is also known as insect bite dermatitis. Skin lesions are usually found on exposed areas, such as the face, neck and extremities, and are scattered or can be clustered in groups, manifesting as red fusiform papules, often with small blisters on top, and a few can appear as large blisters. The skin damage is accompanied by significant itching, and in severe cases even affects daily life. Scratching often causes local erosion and secondary infection. The lesions gradually fade, leaving brown pigmentation locally. Sometimes mosquito bite marks can be seen in the center of the lesion. Individual sensitive people, the bite can appear a large red swollen spot, if it occurs in the eyelids, hands and feet back, scrotum, foreskin, lips and other loose tissue parts, the edema is more obvious.