text: It's possible that what you call a bruise is really blood from the hand wound pooling up in the wrist.  It would be difficult to tell the difference without a professional test or two.  If she experiences painful tenderness when touched on the wrist, then it's most likely an unrelated bruise.  Blood pooling from another injury site might not be especially painful.\n\nKeep an eye on it, and seek medical attention if the bruised area grows larger or doesn't seem to heal on its own.  There could be another injured vein or artery in the hand.