Oedema 35 days after surgery may be caused by obstruction of local blood circulation and lymphatic reflux of the foreskin after surgery. Post-circumcision oedema for more than one month may be due to the ligation of blood vessels and lymphatic vessels in the remaining circumcision stump after circumcision, which may lead to obstruction of local blood circulation of the foreskin, resulting in venous obstruction that requires the establishment of a bypass to alleviate the symptom of vascular obstruction, and the establishment of a slow bypass will have obstacles to the reflux of blood and lymphatic fluids, and due to the existence of a stenotic ring after the operation, the venous reflux will be ineffective, which may also be localized to symptoms of tissue oedema. Tissue edema symptoms. If the edema does not subside, the patient should seek medical treatment without delay. Avoid contamination of the wound by urine and other pollutants, wear loose-fitting clothes and pants, and avoid friction and pressure on the wound.