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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.
Spider veins, a milder type of varicose veins, are smaller than varicose veins and often look like a sunburst or spider web.. They are red or blue in color and are commonly found on the face and legs, just under the skin.aricose veins are enlarged, twisted veins. Varicose veins can occur anywhere in the body, but are more common in the legs. Varicose veins are not considered a serious medical condition. But, they can be uncomfortable and can lead to more serious problems.