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Spider veins named for their resemblance to a spider or spider web, spider veins are a mild variation of varicose veins. They are the small, thread-like colored veins that are most often seen on the surface of the skin. Venules (tiny blood vessels) near the skin’s surface may become permanently dilated because of the pressure of blood inside leg veins. While many people seek treatment for spider veins for cosmetic reasons, spider veins also can result in substantial discomfort requiring therapy.