Repeated blisters on the foreskin may be related to causes such as prepuce glans, genital herpes, allergic dermatitis, etc., which need to be further differentiated and diagnosed by a doctor. 1. Circumcision: manifested as itching of the foreskin and glans, red spots, blisters and ulcers may appear. 2. Genital herpes: mainly manifested in the genitals appear herpes, ulcers, can be accompanied by pain and other symptoms. 3. Allergic dermatitis: if often contact with condoms and other allergenic substances, there can be repeated blisters on the foreskin. It is recommended that people with recurrent blisters on the foreskin go to the hospital in a timely manner to clarify the cause of the disease and standardize the treatment under the guidance of the doctor, so as not to delay the condition to bring adverse effects on the body.