The causes of redness and swelling with blood on the glans after circumcision include over-tight bandage, wound infection, and stimulation by external factors. 1. Too tight bandage: due to the postoperative bandage wound, the bandage is too tight, resulting in the blood circulation of the penis is not smooth, the venous blood back to be blocked, thus causing the glans to appear red, swollen and blood. 2. Wound infection: there may be postoperative wound inflammation infection, when the inflammatory factor constantly stimulate the mucous membrane at the glans, resulting in mucous membrane edema, congestion, which leads to the patient’s glans to appear red and swollen with blood. 3. External factors stimulation: Because the glans is wrapped by the foreskin before the operation, after the operation, the glans is completely exposed to the external environment, it will be stimulated by the external environment, such as underwear friction, environmental stimulation, etc., which will lead to the patient’s glans to appear red, swollen and blood phenomenon. The redness and swelling of the glans with blood after circumcision may also be caused by other factors, if the patient continues to experience this symptom with other discomforts, it is recommended that the patient go to the regular hospital in time to take the correct treatment measures to avoid adverse consequences.