The weakened valves let blood pool from the veins as an alternative to touring to the guts. When blood swimming pools within the veins, the veins turn into much larger, earning them clearly show under the pores and skin. Blood clot. Sometimes a clot can form in a very hemorrhoid. https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-from-the-perspective-of-a-vascular-surgeon/