First, the foreskin of children is normal, with the growth of age and penile development, the foreskin can naturally retreat so that the head of the penis naturally exposed, without premature surgery. If the circumcision repeatedly causes infection, the head of the penis and foreskin adhesion is serious, surgery can be considered. Second, adults with long foreskin, if the penis head can be naturally exposed when the penis is erect, does not affect sexual life, without surgery, but must pay attention to personal hygiene. Because of the long foreskin, repeated infections, narrowing of the outer foreskin, affecting urination and sex life, we must actively take surgical treatment.