Spider Veins, also known as telangiectasias or vascular extasias, are small, widened blood vessels that can develop anywhere in the body but are most often seen on the skin. These small red, purple and blue “threadlike” veins are found on the surface of facial skin and on legs. Spider veins vary in size and often look like a spider’s web or a tree branch. Spider veins are purely cosmetic issues and pose no threat to a person’s health. Since they are usually not associated with deeper vein issues, ultrasound tests are not required for routine cases.