Children with constant redness on both sides of the urethra may be related to physiological causes such as urine stimulation, underwear friction, and other diseases such as urethritis, vulvovaginitis and glansitis. 1. Physiological reasons. When a child urinates without wiping clean the urine, the local urine stimulates both sides of the urethra, which can cause redness on both sides; the underwear is too tight or the fabric is rough, which can also rub the vulva area, causing redness on both sides of the urine. 2. Pathological reasons. When the child urogenital organ inflammation, such as urethritis, eczema, vulvovaginitis, glansitis, etc., there can be a red inflammatory reaction, so that redness on both sides of the urine. When a child has redness on both sides of the urine. Need to keep the area clean and dry, if accompanied by itching, pain and other symptoms, need to seek medical attention.