The possible reasons for the urethral opening a little red are as follows: 1. All kinds of acute and chronic urethritis can appear red and swollen outside the urethra, slightly red around the urethra visible to the naked eye, sometimes with erosion, sometimes with a little discharge, burning in the urethra when urinating, and accompanied by pain in the urethra, are considered to be urethritis. The treatment can be topical antibiotic ointment, such as mupirocin ointment or erythromycin ointment applied externally 2-3 times a day, and can be stopped when the redness and swelling subsides. Observation, no need to take oral medication or intravenous drug infusion and other treatment.