If you don’t change your underwear for a few days, there will be some urine stains left on your underwear, which can cause bacteria to grow in a polluted state for a long time, causing inflammation of the vulva and also edema of the urethra. At this time, consider the presence of bacterial infection caused by the urethral orifice inflammation, change your underwear as often as possible, change your underwear every day, and wash your vulva with warm boiled water every day. At the same time, try not to stimulate the urethra as often as possible, you can drink more boiled water to flush the urethra, to avoid the persistent presence of edema performance, you can first observe 3 days. If the effect is better you can drink more water for prevention, if persistent occurrence need to register urology for routine urine tests to determine whether there is a urinary tract infection, if necessary, oral antibiotics for treatment.