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.

While external hemorrhoids generally go away within a few days, they can develop into a blood clot. This is known as ...