Why is my left elbow very black and painful, like a bruise, and the right elbow normal color?!

Question: Why is my left elbow very black and painful, like a bruise, and the right elbow normal color.?
Answers:

u probobly banged it on the counter or somewhere well my knees are also black and hurt but not much Health Question & Answer

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Why is my left elbow very black and painful, like a bruise, and the right elbow normal color?!

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