Blisters in medicine refers to blisters, the back of the hand long small blisters may be eczema, herpes zoster, tinea versicolor and other diseases caused by the general treatment, medication can be taken. 1. eczema: if eczema caused by the back of the hand long small blisters, daily attention to the affected area dry clean, do not scratch. Patients can follow the doctor’s instructions cold compress boric acid solution, esacridine solution, etc., with antibacterial effect, reduce the blister oozing. 2. Herpes zoster: for herpes zoster caused by the back of the hand long small blisters, need to local clean, avoid friction in the affected area. Patients can follow the doctor’s instructions to take antiviral drugs, such as acyclovir, vasiclovir, etc., which has the effect of inhibiting the virus. 3. Ringworm: If the back of the hand caused by ringworm long small blisters, daily need to pay attention to personal hygiene, keep the local dry. Patients can follow the doctor’s instructions to use topical terbinafine, buprenorphine and other acrylamide drugs, with antibacterial effect. There are many causes of small blisters on the back of the hand, it is recommended that the patient go to the hospital, clear the cause of the disease after treatment.