Blisters are blisters. Small blisters on the hands, if due to ringworm, chickenpox and other causes is somewhat contagious; if it is due to eczema, contact dermatitis, sweat herpes and other diseases, is not contagious. 1. Infectious diseases: (1) ringworm: caused by fungal infection, mainly through close contact or indirect contact and infection, ringworm patients can lead to tinea pedis, tinea corporis, tinea cruris and so on through local scratching. (2) Chickenpox: caused by varicella-zoster virus infection, can be infected through contact with blister fluid or close contact. 2. Non-infectious diseases: (1) Eczema: due to allergic reasons or contact with certain physical and chemical factors, eczema is not infectious. (2) contact dermatitis: due to contact with certain sensitizing or irritating substances and the occurrence of allergic or irritating reactions, so it is not infectious. (3) Sweat herpes: caused by allergies or mental factors, so it is not infectious. Need to go to the hospital, by the physician according to the condition of the diagnosis and treatment, they can not randomly use drugs.