Reticular veins are medium sized veins generally 2-3 mm in diameter. They are typically larger than spider veins, but smaller than varicose veins. Reticular veins are usually a blue-green or purple color and may form areas of unattractive clusters of veins predominantly located on the inner part of thighs or ankles and on the back of the legs. Sometimes, they don't protrude above the skin's surface, but they can be associated with symptoms of pain and discomfort.