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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.
Further varicose veins images show how spider veins are similar to varicose veins but smaller. Spider veins can be red or blue in color, and closer to the surface of the skin than varicose veins, looking like spider webs with their short jagged lines.lthough spider veins usually appear on the legs, they can occur on the face too and are sometimes caused by sun exposure in the fair-skinned. Varicose veins are more common in women than in men, and appear more often in those over the age of 50.