There are three conditions to look out for when you get blisters on your foreskin. The first case, the foreskin glans inflammation caused; the second case, may be allergic reaction caused; the third case, infection herpes virus caused. It is recommended that if you have blisters on your foreskin, you should visit a dermatologist or urologist who can check and confirm the diagnosis. If it is glans vulgaris, pay attention to washing every day to keep dry, usually 2-3 days to recover. If it is a herpes virus infection, there may be blisters and also pain, and this condition must be treated with oral antiviral medication. If it is caused by an allergic reaction, you should eat anti-allergy medication and apply erythromycin ointment locally to achieve a therapeutic effect.