Hematidrosis (also called hematohidrosis or hemidrosis or blood sweat) is a very rare condition in which a human sweats blood. == Signs and symptoms == Blood usually oozes from the forehead, nails, umbilicus, and other skin surfaces. In addition, oozing from mucocutaneous surfaces causing nosebleeds, blood stained tears, and vicarious menstruation... Found on http://en.wikipedia.org/wiki/Hematidrosis