Small blisters on the fingers in summer (blisters in medicine) are very itchy may be caused by herpes sweat, eczema, tinea versicolor and other diseases. 1. sweating herpes: the etiology is not completely clear, may be related to mental factors, local infections, neurological dysfunction and other factors, most often in the summer, easy to recur, manifested in the depth of the skin appeared in small blisters the size of a grain of rice, slightly above the surface of the skin, accompanied by sweating, itching, burning, peeling and other symptoms. 2. eczema: the disease is due to internal and external factors caused by the superficial dermis and epidermis of the inflammatory disease, can occur in any part of the acute stage of eczema lesions to erythema, papules, mainly in severe cases there can be a small blisters, often fused into a piece, accompanied by itching and so on, scratching can lead to the formation of punctate vesicular surface. 3. ringworm: the disease is caused by dermatophyte infection, hand superficial skin fungal infection can appear blisters, flaking, rough skin, flaking, cracking and other symptoms, summer incidence is higher. Itchy small blisters on the fingers in the summer may also be caused by other diseases, it is recommended that patients seek medical attention in a timely manner in order to clarify the cause of the symptomatic treatment.