DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Bruising in the arm of an 80-year-old woman taking warfarin. Bruising is caused by the rupturing of small blood vessels (capillaries) beneath the skin. Warfarin is a blood-thinner that stops platelets from clumping together and forming blood clots. Therefore, patients taking such medicines are at a higher risk of bruising than normal.
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