What Are Varicose Veins? Varicose veins commonly occur on feet and legs and can be characterized by enlarged, swollen, twisted, lumpy, bulging in nature. Sometimes patches of capillaries are formed in the legs and knowns as spider veins. This condition can occur when a faulty valve in the veins allow the flow of the blood in the opposite direction. They usually blue to dark purple in appearance. Generally, any vein can become varicose, but they usually affect legs more…