Circumcision in adults is usually performed for a tight foreskin (phimosis) or for recurrent infections. It can be carried out under local anaesthetic, or general anaesthetic and most patients go home the same day. The entire foreskin is removed, leaving the glans (head) of the penis exposed.
Following surgery, some men notice that the sensation of the penis feels different. This is because the glans is a very sensitive area and it is now exposed permanently. The glans will become less sensitive over time. Other risks of surgery include infection and a small risk of bleeding. A small number of patients are unhappy with the appearance of their penis following surgery. Any swelling that occurs following surgery usually settles within a few days.
An excellent information leaflet can be found at: