A sore foreskin with small blisters may be caused by warts, flat warts or genital herpes. 1. Warts: High-risk sexual behavior is likely to cause human papilloma virus infection, inducing warts. The virus can cause irritation to the skin of the foreskin area, causing pain and small blisters in the area, as well as the appearance of superfluous organisms. 2. flat warts: crowd contact flat warts patient’s clothing, can cause the spread of the virus induced flat warts. After suffering from this disease, the patient’s foreskin area can also appear in varying sizes of small bubbles, with the progress of the disease can cause skin irritation, caused by the foreskin pain performance. 3. Genital herpes: genital herpes can be induced by herpes simplex virus infection, the disease can lead to herpes and ulcers around the genitals, easy to appear foreskin pain with small bubbles. Painful foreskin with small blisters may be caused by a variety of reasons, the patient should go to the hospital in time to receive treatment.