You may be noticing tiny little blue/purple veins appear on your legs thighs, calves, and ankles. We call them spider veins. In some women, spider veins become noticeable at a young age. For others, the veins may not become obvious until much later. Either way, many women find them unsightly. Spider veins are not the same as varicose veins. Varicose veins are larger blood vessels that have become swollen and twisted. They are larger, dark blue and stick out from the skin. There are a number of reasons spider veins start appearing and several way to treat them.