And then what? Experts say that the foreskin ulcer may be caused by bacterial infection, manifested as erythema on the glans, and there may be small pustules or papules on the surface. It can also be manifested as local edema of glans mucosa, slight desquamation at the edge, papules and pustules can spread around to form glans erosion, or it may be caused by sexually transmitted diseases, such as condyloma acuminatum, so male friends should pay enough attention to it. The causes of male foreskin ulcer are: 1. Gonorrhea is caused by Neisseria gonorrhoeae (hereinafter referred to as Neisseria gonorrhoeae), which is a sexually transmitted disease characterized by purulent infection of genitourinary system. Gonorrhea seriously affects patients' health and causes other complications. Symptoms of gonorrhea can appear in the eyes, pharynx, rectum and pelvic cavity. Early detection and timely treatment of gonorrhea are very important for effective control of the disease. 2, caused by genital herpes: genital herpes is a sexually transmitted disease, there are many ways of infection, but primary genital herpes is mainly caused by sexual contact. Genital herpes is a common disease among sexually active people. A survey shows that about 30% of sexually active people suffer from genital herpes. 3. Condyloma Acuminatum is one of the most common sexually transmitted diseases, which not only brings great pain to the patients themselves, but also poses a great threat to the whole family.