It is relatively late to have circumcision at the age of 20. When the foreskin is narrowed, the glans cannot be exposed, so urine is easily left in the glans cavity, and the amount of foreskin scale increases. Therefore, it is recommended that children can undergo circumcision after the age of 8 years old. Moreover, children who are 8 years old tolerate pain relatively well, and most of them can undergo surgery through outpatient local anesthesia. When circumcision is performed, the external urethral opening cannot be revealed at all, and the glans cannot be revealed, so there will be long-term chronic stimulation of prepuce and urine scale, which will easily cause infection and even increase the incidence of penile cancer. The surgery of circumcision is relatively simple and the recovery is relatively fast, usually the surgery takes about 20 minutes and the recovery is about 10 days after the surgery.