I believe many men have encountered redness and swelling at the urethra in their daily lives, but most patients do not know much about this condition. So, what exactly is going on with ulcers in the male urethra? The following is a detailed introduction for you. The urethral orifice is a manifestation of genitourinary infection and is most common in men with acute urethritis. The reason for this is a variety of, the most fundamental reason is the invasion of pathogenic microorganisms (such as gonococcus, mycoplasma, chlamydia, candida albicans, etc.) into the urethra. In addition, masturbation, smoking, drinking alcohol, wearing tight underwear, riding a bicycle for a long time, urethral foreign body, etc., can make the urethral mucosa resistance is reduced, easy to infect the disease.