Spider veins (also referred to as telangiectasias) are small, thin vein patterns that often appear red, blue, or purple in color. These veins are very common around the face and legs. Spider veins may cause discomfort or pain in some cases. Varicose veins are larger than spider veins. These veins may cause bulging and often appear as blue or flesh-colored. Varicose veins primarily affect the legs and can cause throbbing, aching, and pain.