Redness and swelling of the urethra but no other symptoms may be caused by clothing rubbing the skin, or the symptoms may be caused by an inflammatory infection. When walking in some tight clothes and tight underwear, the clothes will rub the urethra area and break the skin, which will appear red and swollen. In addition, there may be due to inflammation and infection caused by the phenomenon of urethral redness and swelling, and such patients are mostly due to hygiene is not clean, not often wash the private parts of the bacteria caused by breeding, you can through the application of erythromycin ointment or through the permanganate of potassium solution for cleaning, the drug needs to be applied under the guidance of a doctor. People with urethral erythema are advised to maintain a light diet, and during the treatment period, they need to change their underwear regularly to keep the local hygiene dry and clean. If the patient is not feeling well, he should consult the doctor for examination and early treatment.