Basically, blood clots commonly form on broken blood vessels. It's the body's way of trying to heal damage to the lining of blood vessels. The following URL gives a detailed explanation with pictures:
The blood clots I get from flareups are round like a ball, about
one inch in diameter.
Another good article about
It mentions blood clots under complications.
Post Edited (subdued) : 9/20/2010 12:45:08 AM (GMT-6)