The vast majority of circumcision is congenital, and after birth, the affected child will be born with the foreskin encasing the glans. After birth, it is recommended that the foreskin should be turned over and cleaned as well as the glans every day. Long-term phimosis can easily lead to glansitis and increased accumulation of foreskin scale, which has the risk of inducing penile cancer. When the foreskin is too long, when the child is young, the foreskin is loose and soft and can be easily turned over. As the affected child gradually starts to develop and the development of the penile body accelerates, the foreskin will naturally recede to the back of the glans coronalis. If not turned often, the foreskin will always be there, affecting future sexual life and prone to premature ejaculation, etc.