DR. ARTHUR TUCKER / SCIENCE PHOTO LIBRARY DR. ARTHUR TUCKER / SCIENCE PHOTO LIBRARY
Varicose veins. Varicose veins. Thermogram of the legs of a 56-year-old woman, showing severe varicose veins in the left leg (right). Varicose veins are lengthened and dilated veins that can develop just below the surface of the skin. They can occur for no apparent reason. Here the varicose veins appear hotter (red) than the rest of the leg. The colour-coded heat display here runs from purple and blue (coolest) through green and yellow, to red and white (hottest).
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