Thinner people have thinner skin and less subcutaneous tissue, so the blood vessels are more prominent and just obvious, as long as the blood vessels are not obviously tortuous, then they are normal. If the blood vessels in the feet have obvious tortuosity and the color of the skin changes, consider whether there is a problem of venous insufficiency in the lower limbs. Ultrasound examination is needed to understand the function of the venous valves of the lower limbs, including the function of the valves of the deep and superficial veins, and if there is a problem with the function of the valves, the protrusion of such vessels, also known as venous protrusion, is a pathological phenomenon that requires further treatment.