The body grows like a mosquito bite bag, but also itchy, consider the possibility of insect bite dermatitis. Insect bite dermatitis is an inflammatory skin disease caused by insect bites on human skin. Insect bite dermatitis, formerly known as papular urticaria, insect bites can be injected into the skin after the saliva to cause an allergic reaction, the injection of saliva may be the allergen, multiple bites can produce tolerance phenomenon, desensitization phenomenon. The rash is a spindle-shaped papule with intense itching and no systemic symptoms. In the treatment, first of all, we should maintain hygiene, kill pests, pay attention to the prevention of mosquito bites, and exclude allergenic food, etc. We can take oral antihistamines, such as Olopatadine tablets, loratadine tablets, etc. for anti-allergy and anti-itch treatment, and topical application of glyburide lotion, or glucocorticoid creams, such as Denide cream, etc. for anti-allergy treatment.