In later life it is less common and is usually performed for medical reasons. There are two common methods. The foreskin is then cut off, and the device is removed. In adults, the foreskin is carefully cut and stitched. An anesthetic is not used for newborn babies, but it is used for a child or an adult.
Mistakes are extremely rare but can occur.
Too much or not enough skin may be removed, as may part of the glans itself. Damage may be caused to the urethra, or severe bleeding may occur. This causes the foreskin to become scarred and abnormally tight. All of these conditions can be corrected by circumcision. These differ from culture to culture.