Spider veins are enlarged veins but smaller than varicose. They also are closer to the surface of the skin than varicose veins. Often, they are red or blue. They can look like tree branches or spiderwebs with their short, jagged lines. They can be found on the legs and face and can cover either a very small or very large area of skin. The medical term for spider veins is telangiectasis.
Spider veins can be caused by the backup of blood. They can also be caused by hormone changes, exposure to the sun, and injuries. Spider veins rarely are a serious health problem, but they can cause uncomfortable feelings in the legs and primarily causing cosmetic problems. In general, sclerotherapy and laser therapy are helpful in treating spider veins.