Summer, both humid and hot, is especially prone to mosquitoes and other insects, especially in areas with lush vegetation. Insect bites are not only annoying, they also tend to cause disease. Insect bite dermatitis, or papular urticaria, is an allergic reaction caused by the bite of insects such as mosquitoes, bedbugs, fleas, lice, mites and midges. It is a common allergic skin disease in infants and children, but adults can also suffer from this disease. Often several people in the same family develop the disease at the same time, with more occurring in the spring and fall. The rash mostly occurs on the trunk and extensor side of the limbs, dense and scattered cases have. Unlike ordinary mosquito bites, the rash is mostly presented as red bumps with a slightly fusiform shape, often with small blisters at the top, some of which become large blisters soon after occurrence, and are swollen like windbags after scratching. The old and new rashes often coexist. Young children generally have significant redness and blistering, and often feel intense itching and even sleep disturbance. The cause of insect bite dermatitis is that mosquitoes, bedbugs, fleas, lice, mites, midges and other insects inject poisonous juice into the body while biting, and people who are allergic to these substances will develop antibodies. This is a delayed allergic reaction, from the mosquito bite to the occurrence of allergy to about 10 days, when the bite again will contribute to the rash occurs. Repeated bites can produce desensitization, so the disease generally stops at about 7 years of age. The reaction to insect bites varies depending on the individual’s body type. There are many types of insects that cause insect bite dermatitis, the most common of which are mites, which are very small and can be found everywhere in nature, and can cause insect bite dermatitis both directly on the skin and through the secretions they produce such as feces and saliva. The prevention of disease is more important than the treatment, insect bite dermatitis prevention method is actually very simple: 1, improve the environment, living room and personal hygiene, diligent bathing and changing clothes, bedding bedding to pay attention to frequent change and drying to prevent breeding mites. Insecticide can be used at home to eliminate pests, and fleas and other parasites on pets should be dealt with in a timely manner. 2, pay attention to protection, walking in the field or lush plants to wear long clothes and long pants, you can also use insect repellent. Try to avoid playing outside at dusk when mosquito activity is at its peak. Insect bites do not pat, will be better to dust them off. 3, sensitive skin prone to dry peeling, should pay attention to the skin hydration, keep moisturized. When the skin is itchy, you can use topical anti-itching agents such as furnace glycolic lotion, etc. Avoid excessive scratching. Once the insect bite dermatitis should be treated promptly, avoid strong scratching and hot water scalding to prevent infection. If the symptoms are relatively mild, topical creams such as glycolate lotion, dinaide cream, hydrocortisone cream can be used, pay attention to diet, eat less spicy stimulation, alcohol, seafood and cattle, mutton, dog meat and other foods. If there is no relief or the symptoms are heavy, please seek medical attention without delay.