After circumcision, the glans is locally black then the possible reasons: 1, after conventional circumcision, the local need for moderate pressure bandage to reduce edema, and to play the role of pressure hemostasis. Sometimes the bandage is too tight or the patient has frequent erections after the bandage, resulting in the bandage’s elastic bandage becoming tighter and tighter, resulting in local ischemia, and the glans can appear swollen and blue and black. It is recommended to immediately go to the hospital to loosen the elastic bandage and re-bandage to avoid ischemia. 2, circumcision process, due to local vascular bleeding, may be ligated corresponding bleeding parts. Especially the blood vessels at the ligature, bleeding relatively more, sometimes in the ligature or suture ligation lead to local ischemia and local blackening of the glans. The actual black and blue situation can gradually disappear with the recovery of the local blood flow again, and there is no need to worry too much. 3, circumcision surgery, sometimes using electric knife or use of laser knife, etc., will local burns, may appear local black situation. With the healing process, can fully recover, no need to worry too much.