These veins, which can appear purple or bluish, are commonly called spider veins or early varicose veins. They form when the small valves inside veins weaken, allowing blood to pool instead of flowing upward toward the heart.
Gravity plays a major role in this condition, which is why the legs are particularly affected. Standing or sitting for long periods increases pressure in the veins, making purple or bulging veins more noticeable over time.