Fine red or blue spider veins less than 1 mm in diameter. They appear as a faint red line, tree branches, or spider patterns and are smaller than varicose veins. Spider veins can appear on the legs and might cover a little or large area.
Small varicose veins, also known as reticular veins, are small blood vessels measuring 1 to 3 mm in diameter. Small varicose veins might expand due to high vein pressure or compromised vein valves. Small varicose veins or both small varicose and spider veins are possible.