After circumcision potassium permanganate immersion produces dirt using sterile saline rinse can be clean. After the circumcision needs to be daily disinfection of the foreskin, potassium permanganate soaked dirt may be due to local blood coagulation or local foreign body, generally through the sterile saline rinse dirt can be self-laundering, after cleaning can be wrapped with sterile gauze on the wound. Patients should not try to scrape off the dirt by themselves, to avoid causing local bleeding, edema and infection after circumcision. Therefore, when the discovery of post-circumcision discomfort or localized dirt, it is recommended to go to a regular hospital to seek professional medical help, do not violently scrape the wound to avoid causing secondary damage.