Foot long small blisters very itchy may be a fungal infection caused by tinea pedis, or foot sweat herpes, should be timely consultation based on clinical manifestations and related examinations to confirm the diagnosis. 1. Tinea pedis: caused by fungal infection, blisters on the feet are commonly seen in blister tinea pedis, that is, toes, palms of the feet, lateral margins of the feet and other parts of the emergence of a number of pinpoint-sized deep in the blisters, remove the blisters on the surface of the skin was bright red honeycomb vesicular surface, often accompanied by obvious itching. 2. Sweat herpes: the occurrence of this disease is related to hyperhidrosis, chemical agents and other contact stimulation, genetic factors, mental and psychological factors. The manifestation of the lateral edge of the toes, the palm of the foot and other parts of the appearance of rice-sized blisters, and accompanied by itching and pain in the skin. It is recommended to consult the doctor promptly after the appearance of the corresponding symptoms, and carry out fungal examination and laboratory tests to confirm the diagnosis.