For the fourth day after circumcision, there is discharge from the urethra, which is generally considered to be caused by infection of the incision and related to the wound being contaminated. The presence of urethritis and sexually transmitted diseases before the operation can also show the above symptoms. 1.Wound infection: (1) Intraoperative circumcision is not thoroughly cleaned, and the surgical incision is contaminated by bacteria, especially for circumcised patients, because the foreskin is closely adhered to the head of the penis, it is often not easy to be completely cleaned at one time, and it is necessary to disinfect the wound with 1% iodine povidone while separating it. (2) The postoperative surgical incision is not tightly bandaged because repeated penile erection leads to the loosening of the surgical incision dressing, as a result, the surgical incision is contaminated, and it is not sterilized in a timely manner. The surgical incision dressing is contaminated by urine impregnation without timely change of dressing. (3) When the circumcision incision appears subcutaneous hematoma because of bleeding, more serious circumcision edema, adhesion separation after injury, mechanical friction, etc., if the treatment is not active is more likely to secondary bacterial infection. (4) surgical sutures longer affect the surgical incision (silk thread is common), resulting in redness, swelling, erosion of the eye of the needle, also easy to combine bacterial infection. 2. Urethritis: patients are often accompanied by urinary frequency, urinary urgency, urinary pain and other symptoms of urethral irritation, due to the increase in inflammatory secretions, which can flow from the urethral orifice, and need timely anti-infective treatment. 3. Sexually transmitted diseases: common urethral discharge increased disease for gonorrhea, patients have unclean sex, combined with medical history and bacterial culture can be clearly diagnosed. If you find a discharge, you should go to a regular hospital to get a clear diagnosis, and follow the doctor’s instructions for medication, do not self-medication.