Anal hematoma - thrombosed piles

This condition a.k.a Perianal Hematoma is located on the border of the anus or in it. But it is definitely not any external Hemorrhoid. The symptoms of this condition come up over a short period of time. Mild to severe pain will occur as the skin which surrounds the rupture will expand. Even after the blood has clotted, this pain will continue to trouble you for up to 2-4 days.

A small vein in the anus is ruptured which drains blood. It may happen because of strained bowel movement or a forceful one. It can also be caused by any other activity like straining, heavy lifting, coughing etc. as it ruptures, within a few hours, blood pools and clots, if it is left untreated.