Blisters are medically known as blisters, and itchy small blisters on the palms of the feet may be caused by ringworm of the feet, eczema, sweat herpes and other common causes. 1. Tinea pedis: Tinea pedis is a skin disease caused by fungal infection of the skin, which can be induced by damp feet, wearing breathable shoes and socks, not paying attention to foot hygiene, diabetes, etc. It can be manifested as a cluster or distribution of small blisters on the feet and can be accompanied by itchiness, impregnation, whitening, erosion and other phenomena. 2. Eczema: small blisters on the palms of the feet can be itchy eczema, the cause of the disease is not clear, may be genetic, immune abnormalities, hormone level abnormalities, etc., there can be blisters and other manifestations, accompanied by intense itching, mostly symmetrical. 3. Sweat herpes: small blisters on the palms of the feet itching may be sweat herpes, is a symmetrical, recurrent blistering disease of the hands and feet, the cause of the disease may be associated with poor sweating, the palms of the feet can appear pinpoint to rice grain size blisters, can be accompanied by itching. Small blisters on the palms of the feet, itchy, it is recommended to promptly go to the hospital dermatology department to clarify the cause of the disease, under the guidance of the doctor for active treatment.