Every summer, the number of patients with papular urticaria increases rapidly in outpatient clinics. This disease can be prevented, so it is necessary to explain the prevention of this disease. Papular urticaria, clinical erythema, papules, papules as the main manifestation, the lesions are characterized by a pinpoint black spot visible in the center of most erythema, papules, this is both the site of insect bites, severe lesions can appear on the basis of the original erythema blisters, accompanied by varying degrees of itching. Papular urticaria has the following salient features 1, the onset of a certain seasonality, and the active degree of bugs is positively correlated, that is, in the season when the bugs are active, the disease is high, in the north, such as spring, summer, autumn is more serious, but the winter home temperature is higher when the bugs are active is also more obvious, can also develop; 2, the onset of the disease has a certain predilection for the site, generally for the exposed parts and the waist, because the exposed parts are most likely to be Insect bites, such as hands and feet, limbs, waist area is also a good site, because if the insects into the clothes, it is easy to be restricted to the peri-waist activities, so the peri-waist area must be a good site; 3, the onset of the disease can generally be traced to the obvious history of contact with insects, such as going to the grass, parks, farmers before the onset of labor history in the fields, there are obvious pets such as cats, dogs and other contact history, or the family has pets; 4. The disease can occur repeatedly and in batches; 5. The chances of going to a foreign place are significantly higher than local, and the symptoms are obviously heavier. The reason for this may be that there has been no contact with bugs in foreign places in the past, and the allergic reaction is stronger (my speculation), especially in children, blisters and blisters are more common; 6. The younger the age, the heavier the disease, and it is easy to develop. Papular urticaria how to prevent it 1, indoor to keep dry, especially the bedroom, indoor humid family, bedding often sunshine; 2, indoor bugs appear can use insecticide; 3, humid, mites more places to go as little as possible or not, such as warehouses, unused storage rooms; 4, parks, grass as little as possible; such as foreign travel hiking, hands and feet and other parts as little as possible exposure; 5, as little as possible Contact with pets.