Thrombosed External Hemorroids
Thrombosed external hemorroids are those that occur outside of the anal verge (the distal end of the anal canal). They are usually painful, and are often accompanied by pruritus ani or an itching, swelling, and burning sensation. If the vein ruptures and a blood clot develops, the hemorrhoid becomes a thrombosed external hemorrhoid.
The set of veins just about the anus causes problems when blood clots form in them, and they turn into large and painful. (These are called thrombosed external hemorroids.) You could note bleeding and a tender lump on the edge of the anus.
Bleeding starts when the swollen veins are hurt or broken by straining or rubbing. People who have external hemorroids may experience itching at the anus too. This might outcome from draining mucus and irritation caused by too much rubbing or cleaning of the anus.