Peripheral artery disorder: A blockage with your legs. Complete loss of circulation can lead to gangrene and lack of a limb. This is what occurs with varicose veins. They might bulge like purple ropes underneath the skin. They might also look like smaller pink or purple bursts with your knees, https://www.sgvascularctr.com/exploring-vascular-malformations-informative-guide-for-singaporeans/