Blisters are medically referred to as blisters. Itchy small blisters on hands may be caused by herpes sweat, contact dermatitis, hand eczema, tinea cruris and so on. 1. Sweat herpes: Sweat herpes is a recurrent, blistering disease that occurs on the palms of the hands and fingers, usually due to sweat on the hands, contact with cool water or alkaline lotion, sweat is not easy to discharge, the formation of pimples or blisters, accompanied by itching. 2. Contact dermatitis: If the hands are in contact with irritating substances for a long time, such as soap, detergent, etc., it may lead to contact dermatitis and itchy small blisters on the hands. 3. hand eczema: if the outside world stimulation or allergic substances, may lead to skin immune response, caused by hand eczema, resulting in small blisters on the inner and outer sides of the hand and the heart of the hand is very itchy situation occurs. 4. Ringworm: generally the skin of the hand is infected by fungi, easy to trigger ringworm, may also lead to small blisters on the hand is very itchy symptoms. Patients with itchy blisters on their hands should go to the dermatology department of the hospital in a timely manner to clarify the cause of the disease and comply with the doctor’s instructions to standardize the treatment.