In rectal prolapse, the rectal mucous membrane projects
through the anus, giving the impression of a moist red doughnut with glowing
lines. It arises following a Valsalva maneuver, such as straining at stool, or
with exercise. These symptoms are reliable with an external hemorrhoid.
An external hemorrhoid comprises clotted blood and becomes a throbbing, inflamed,
shiny blue mass that itches and exploits with excretion.
