Small blisters on the hands in hot weather are very itchy to be dealt with according to the cause of the disease, if it is sweat herpes can be general treatment, medication, if it is eczema can be general treatment, medication, but also need to consider ringworm. 1. Sweat herpes: sweat herpes is mainly manifested in the palms of the hands, soles of the feet, fingers, toes on both sides of the scattered or multiple blisters, accompanied by varying degrees of itching, burning sensation, the general treatment includes avoiding contact with allergens, pay attention to hand hygiene, timely drying, you can follow the doctor’s advice to take benadryl, cloratadine, etc., but also the external use of tretinoin urea ointment, salicylic acid ointment and so on. 2. Eczema: hand eczema patients can also appear blisters, itching, and itching is more intense, the general treatment includes reducing external stimuli, avoid eating spicy stimulating food, can follow the doctor’s advice oral cetirizine, loratadine, can also be used externally with glycerine lotion, boric acid solvent and so on. 3. Ringworm: patients can go to the hospital to do fungal examination, clear diagnosis and follow the doctor’s instructions for external use of ketoconazole cream and other drugs. It may also be caused by other reasons, it is recommended that patients go to the hospital in a timely manner, after a clear cause of treatment. The application of drugs need to strictly follow the doctor’s instructions.