paraphimosis may occur after an erection or sexual activity or as the result of injury to the head of the penis. with paraphimosis the foreskin becomes stuck behind the ridge of the head of the penis. if this condition is prolonged it can cause pain and swelling and impair blood flow to the penis. in extreme cases the lack of blood flow can result in the death of tissue (gangrene) and amputation of the penis may be necessary.
what causes paraphimosis?