Hard to tell: The bruising would imply an injury, even minor. If your blood is normal you most likely would have noticed the injury, even if you were asleep (people sometimes twist or pull or bump parts of themselves when they're asleep and wake up injured, not knowing what happened). The back burning could be from injury or kidney infection or hard to tell what. You should see a doctor for better evaluation.
Answered 3/22/2015
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