Thrombosis of an external hemorrhoid causes an anal lump that is very painful and tender, and often requires medical attention. Thrombosed hemorrhoid may heal with scarring, and leave a tag of skin protruding in the anus. The clot within the hemorrhoid will need to be removed with a small incision.
Thrombosed hemorrhoid is one among the most severe forms of hemorrhoids. In this form of hemorrhoid the vein gets clotted. Even though the hemorrhoid is painful it does not require any kind of surgery to be removed. They happen to occur in the anal canal or on the external side as external hemorrhoids and vary in the size.
Related Journals of Hemorrhoid Thrombosis
Seminars in Thrombosis and Hemostasis, Thrombosis and Haemostasis, Arteriosclerosis, Thrombosis, and Vascular Biology, Clinical and Applied Thrombosis/Hemostasis, Journal of atherosclerosis and thrombosis.