Vascular lesions are blood vessels that are visible through the skin. The harmless lesions look blood-colored, with either a red or purplish hue. Standard types of vascular lesions include: spider veins, telangiectasia, port wine stains, and hemangioma. They can occur on almost any part of the body, but are especially common on the face or legs. There are many causes of vascular lesions, and they often appear as a side effect of aging. As such, laser treatment of vascular lesions has become a popular cosmetic procedure for people concerned about their skin appearance.