If you have a rash on your foreskin, it is advisable to visit a hospital to clarify the specific cause, the possible causes are as follows: 1, local erythema due to local infection of the foreskin, which can be accompanied by local bumps, rupture or bleeding, etc., and accompanied by pain. The actual fact is that you will need to go to the hospital for a relevant examination to clarify whether or not the foreskin is infected; 2, acne, through unclean sexual contact, infected with human papillomavirus caused. The actual fact is that you can find a lot of people who are not able to get a lot of money from the internet. And can be disseminated growth, can be distributed to the glans, urethral orifice and even penile body, perineal area and other parts of the body, need to be surgically removed; 3, local allergy, commonly due to systemic allergy local performance after the use of drugs. In addition to a rash on the foreskin, it can also be accompanied by rashes on other parts of the body, it is recommended to go to the hospital to further confirm whether it is allergic.