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If you are hammering away, watch out, pay attention and don't get distracted, because before you know it, you'll be hammering on your knee: What the fence, that will become a bruise. Such a bruise is actually red deep inside. The impact damages the fine veins under your skin. A lot of blood is released, which is why such a spot is also called a hematoma. Your skin acts as a kind of color filter, so you see the red blood as blue. And in the coming days, the spot can turn all the colors of the rainbow. That is because your body gets to work to remove the clotted blood. And eventually the bruise removes itself. Nice, Mother Nature! If you like to walk around with bare legs, and don't feel like answering difficult questions, you should get to work immediately after the impact. Cool with ice! The cooling causes the capillaries to contract, and less blood leaks from the vessels. That way, you can parade on the street again in no time. Watch out for posts...