Phimosis is a disorder in which there is congenital or accidental narrowing of the preputial ring of the penis, which prevents it from being withdrawn to show the glans. It is common in children and may occasionally be caused by forced retractions of the foreskin at an early age. It can also be caused by an infection or by the scars that form after an injury. Phimosis can be corrected by a simple surgical procedure called circumcision, which involves removing excess skin surrounding the glans, leaving it permanently exposed. On the other hand, paraphimosis is when the foreskin cannot be placed above the glans. Generally, it causes pain and a little swelling, and usually occurs in children or elderly people who have not been circumcised.