The possible causes of swelling below the female urethral orifice: 1, urethral orifice infection, when the infection appears after the urethral orifice local tissue congestion, edema, the appearance of visible redness and swelling and other phenomena, accompanied by urination when the urethral orifice stinging symptoms, often seen in poor personal hygiene attention leading to local infection, the urethral orifice redness and swelling, can be treated with topical antibiotic ointment topical. 2, urethral meatus, often seen in The red or purplish flesh-like structure below the urethral opening. If there is no co-infection, there is usually no pain. Sometimes thrombosis can cause a significant increase in the size of the flab with significant pain, which may be related to declining hormone levels, urethral mucosa prolapse, etc. Sometimes the urethral meatus can block urination, causing the patient to have symptoms of dyspareunia and requiring surgery.