If there are small blisters on the foreskin, it is recommended to go to the hospital for further examination to clarify the possible causes. First, herpes virus infection. It can appear on the foreskin in clusters of blisters, accompanied by localized redness and pain. Most of them are transmitted through impure sexual contact, if they appear after sexual contact transmission. It is necessary to test for the herpes virus, and after the diagnosis is confirmed, local treatment and drug antiviral therapy is required. Second, when there is a foreskin infection can also appear to have foreskin blisters. The first manifestation is the redness and swelling of the foreskin, after which a single or multiple blisters can appear, the blisters are more clear and scattered, accompanied by local pain. With the healing of inflammation foreskin blisters can gradually disappear. Thirdly, if there has been trauma to the foreskin, such as extrusion injury or excessive masturbation, excessive stimulation of the foreskin can also appear tension blisters. The skin is red, a single blister appears, and the herpes is clear with mild local pain.