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As in the arteries, the walls of veins have three layers, or coats: an inner layer, or tunica intima; a middle layer, or tunica media; and an outer layer, or tunica adventitia. Each coat has a number of sublayers.
When compared to varicose veins, spider veins are typically smaller in size. While these also tend to twist and turn, the color can range from red to purple to blue, which is not as common with varicose veins. Spider veins are most common on the legs and face, but these can be seen on other parts of the body, such as the arms. Causes of Spider Veins