DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Bruised arm of a 75 year old man after being pulled by a dog on a lead. Bruising is caused by the rupturing of small blood vessels (capillaries) beneath the skin. This patient was taking prophylactic (preventative) aspirin at the time, a blood-thinner that stop platelets from clumping together and forming blood clots. Therefore, patients taking medicines such as these are at a higher risk of bruising than normal.
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