The circumcision of a 12-year-old boy means that the outer opening of the foreskin is narrow and tightly clamped to the tip of the glans, so that the foreskin cannot be turned up to reveal the glans and the coronal sulcus. It may affect the normal development of the penis; as the dirt in the coronal groove cannot be discharged in time, it may lead to local infections and urinary tract infections; if the foreskin is forcibly uplifted, it may cause complications such as incarceration of the foreskin; and due to the long-term stimulation of dirt, it may also increase the risk of penile cancer. If you are circumcised, you should go to the hospital as soon as possible for surgical treatment, which is beneficial to avoid affecting penile development and preventing penile cancer. The circumcision is a surgical procedure, which can be performed on an outpatient basis. After the surgery, change the medication on time, follow the doctor’s instructions for local care, and pay attention to the prevention of infection.