JACOPIN / BSIP / SCIENCE PHOTO LIBRARY JACOPIN / BSIP / SCIENCE PHOTO LIBRARY
Illustration of a varicose vein. On the left, a healthy vein, with all valves working normally, letting blood return to the heart without blood flowing back the way it came. On the right, a close up of a varicose vein caused by valve malfunctioning. The varicose vein is located between the muscle and skin which puffs up with the swelling of the vein.
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