Circumcision is a condition in which the skin of the penis wraps around the glans after puberty, so that the glans cannot be fully exposed. The foreskin can be clinically divided into true circumcision and pseudo-circumcision: 1. True circumcision is a state in which the glans cannot be fully exposed after erection; 2. Pseudo-circumcision is a state in which the glans cannot be exposed when the penis is weak, but the glans can be fully exposed when the penis is erect; circumcision is a state in which the foreskin completely wraps around the glans, so that the glans cannot be exposed whether the penis is weak or erect or The foreskin mouth is narrow or the foreskin and the head of the penis are attached so that the foreskin cannot be turned up and the glans cannot be exposed.