Constriction of the penis behinds the glans (head) by a severely tight foreskin that has been pulled back, creating pain and swelling. Paraphimosis usually arises as a complication of an unusually tight foreskin.
The problem can often be treated manually by applying an ice pack to reduce swelling and then squeezing the glans to return the foreskin to its usual condition. Otherwise, an injection or operation to slice the foreskin can be needed. Circumcision (surgical removal of the foreskin) can be carried out to prevent recurrence.