Why does it sometimes take days for a bruise to become visible?

Question: I walked into a cast iron sink that was in the hallway waiting to be installed.I hit the edge of it with my lower shin REALLY HARD! I knew as soon as I did it that it had left a mark, because it bruised immediately, and badly.So someone moved the sink, presumably so no one would hurt themselves again, but I didnt know they had moved it.I was carrying something and didnt see it( I know.I know.)I hit the other shin as hard as the first one.This time, however, there was no bruise right away.Instead,I woke up 2 days later and the bruise is ENORMOUS!What was the difference?
Answers:
It can depend on how deep the vessel was that was injured with the bump. You can bleed deeply and it takes several days for the blood to surface hence the late blooming bruise or. you injured a vessel but it did not break open, then in your sleep you hit it or pulled by stretching and the injured vessel then leaked hence the bruise.

Other Answers:
Exactly what vicki said. It depends on which capilary beds were affected. typically the most affected are the capilary beds nearest your epidermis. Sometimes you can affect capilary beds in muscle tissue, which of course, will take some times to show signs of damage. Neither are indicative of anything serious in less you are unable to produce platelets or fibrin to stop the bleeding.

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