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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.
What are varicose veins? Varicose veins are veins that are swollen and bulge above the surface of the skin. They may be twisted and are often blue or dark purple. Varicose veins are most commonly found on the legs or feet, but they can also be found on the groin. Varicose veins that you see are just under the surface of the skin.