👉 Bingo veins are a rare, rare medical condition in which tiny blood vessels appear on the skin's surface. They usually appear on the legs and feet of patients suffering from chronic venous insufficiency, a condition where the veins in the legs fail to pump blood back to the heart effectively. These veins resemble the dots of a bingo card, hence the name "bingo veins." Although they are harmless, their presence can be a sign of underlying circulatory problems.