Spider veins on legs and spider veins on thighs are small, visible blood vessels that appear as red, blue, or purple web-like patterns just beneath the skin. They commonly develop due to weakened vein valves, causing blood to pool and become more noticeable over time. While often considered a cosmetic concern, spider veins can sometimes be linked to underlying vein disease and may cause mild discomfort such as aching or heaviness.
https://www.usaveinclinics.com/vein-disease-symptoms/spider-veins-telangiectasias/