Causes of foreskin redness and pain: 1, excessive stimulation of the foreskin, such as repeated friction, excessive masturbation, etc., then it may lead to local redness and pain of the foreskin. 2, when the foreskin is too long, do not pay attention to personal hygiene, may only chronic irritation factors, resulting in foreskin congestion, edema, pain, etc. 3, when the history of trauma to the foreskin, can appear local redness and pain of the foreskin. If the foreskin is contused due to blowing, cutting, or impact, the corresponding symptoms may appear. 4. When bacterial infection occurs, acute foreskin redness and swelling, pain and other symptoms may appear. 5. Through unclean sexual contact, infection with sexually transmitted diseases, the foreskin redness and swelling, pain and other symptoms may also appear. 6. After circumcision and circumcision suture surgery, local redness and pain may appear in the short term. Sometimes edema is obvious, and can even be accompanied by wound dehiscence.