Hemorrhoids . Strangled hemorrhoids are internal hemorrhoids that have dropped so much they are stuck outside the anus and can't be pushed back to inside the anus. Thrombosed hemorrhoids are the result of a rupture of an external hemorrhoid vessel causing bleeding under the skin and a purple bump on the skin on the outside of the anus. Both are painful and treated with surgery.
Depends. Thrombosed is usually involving external hemorrhoids, and result from vein rupture and leakage of blood under the skin which then clots or thromboses causing pain and swelling and rarely bleeding. Strangulated hemorrhoids refers to interrnal hemorrhoids that have prolapsed to the outside and then been "strangulated by the sphincter muscles and can then often thrombose as well, leading to pain and.