Herpes in children is caused by a variety of factors, physical, chemical, infectious, allergic, immune-related and other factors, as follows: 1, common such as small infants do not change the film diligently, the ammonia produced by the decomposition of urine has stimulated the skin, the formation of diaper rash; 2, infants are infected, especially herpes virus infection will cause the separation of pediatric skin stratum corneum, a large amount of tissue fluid infiltration which, the skin surface will appear Translucent small blisters; 3, skin allergy is stimulated by allergens tissue sterile inflammation, capillary permeability increased plasma infiltration outside the blood vessels, the formation of herpes; 4, some drugs or immune diseases can also cause the epidermal basal cells to occur vacuolation or rupture and the formation of herpes, such as systemic lupus erythematosus, drug rash; 5, too hot liquid or oil scalded skin, causing the skin dermis capillary breakage, the A large amount of tissue fluid exudes to form blisters; children with herpes should pay attention to prevent pediatric scratching, which then causes skin breakage causing infection.