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Thread veins, also known as spider veins, are usually not a medical concern like varicose veins but may be embarrassing because of the unsightly appearance of the veins. The veins may appear blue, red, or purple, and appear as a thin thread that is visible through the skin. If you notice such veins in your legs or elsewhere on the body, speak with a vein doctor to ensure that they are not varicose veins, which may require medical treatment.