All boys have foreskin and it is divided into prepuce and circumcision. Circumcision is when the opening of the foreskin is so small that it completely wraps the glans and the foreskin cannot be flipped open to reveal the glans. A circumcision is when the foreskin is longer and the glans is not exposed, but the opening of the foreskin is loose and the foreskin can be easily flipped open and can be backed up to the back of the glans, exposing the glans and the coronal groove. Many because of the developmental process of the penis, the foreskin is constantly turned up and back completely to the back of the coronal sulcus, which is a more desirable condition. For long foreskin or circumcision, it is recommended to perform circumcision so as to prevent the occurrence of foreskin glansitis, the collection of foreskin scale, and also the occurrence of penile cancer.