When there are blisters on the male foreskin, the causes are the following: first, consider the foreskin is over-stimulated, thus appearing tension blisters, common in mechanical friction or masturbation, after the friction leads to excessive local tension of the skin appear small blisters, stimulation will stop after the blisters will naturally fade. Secondly, the body is infected by the herpes virus, the occurrence of infection and unclean sexual contact, will be accompanied by obvious pain, the blisters can appear more spontaneous rupture, will form a vesicular surface. Thirdly, consider a male suffering from glans circumcision, under the stimulation of inflammation leads to foreskin has local blisters, redness, increased secretions, serious can ulcerate, can be relieved by applying erythromycin ointment. The foreskin blisters should promptly seek medical attention, identify the cause after further treatment under the guidance of a doctor, in daily life to clean the foreskin, need to do a good job of care, to avoid frequent friction or unclean sexual contact.