A thrombosed external hemorrhoid is an enlarged vein that can be seen and felt just beneath the skin around your anus. An external hemorrhoid affects the veins of the skin outside the anus. The ...

This may occur after a bowel movement. An external hemorrhoid with a blood clot inside it is called a thrombosed hemorrhoid.

For small external hemorrhoids, those symptoms don’t tend to last past a few days. However, when people have a thrombosed external hemorrhoid—which is when a blood clot forms—severe pain can ...