Blisters in medicine refers to blisters, small blisters on the fingers of children may be sweat herpes, ringworm, hand, foot and mouth disease and other diseases caused. 1. Sweat herpes: the etiology is not clear, may be related to local infection, dermatophyte infection and other factors. Patients will have intensive small blisters on their hands or feet, accompanied by itching and pain. 2. Ringworm: the etiology may be related to the infection of the hands by pathogenic bacteria such as Trichophyton rubrum and Trichophyton mentagrophytes. The patient’s fingers and palms will have blisters, dryness, flaking and other symptoms. 3. Hand, foot and mouth disease: the etiology is mainly related to enterovirus infection. The patient’s hands, feet, buttocks, mouth and other parts will appear herpes, papules and other symptoms. If children have small blisters on their fingers, parents are advised to take their children to regular hospitals for examination and clarification of the cause of the disease.