ANSWERS: 1
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Rubbing a bruise increases the circulation through the injured area, which aids in the reabsorbtion of the blood cells which caused the bruise. As for rubbing it: people (and animals) often 'rub' or touch their injuries. There are some theories regarding the release of endorphins in injuries which may relate to this. Sources? Hard to find a single one as this requires a knowledge of a number of physiclogical factors (circulatory response, injury response, and endocrine response).
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