This is c/w hematoma: a collection of water & blood which have leaked out of capillary blood vessels in the soft tissue between the skin surface & the bones of you skull which were damaged & leaked as a result of some injury, presumably which occurred while you were asleep or at least not remembered after awakening. Issues: nature of injury & did it possibly affect your brain beyond a minor concussion (not likely).
Answered 9/24/2015
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A doctor has provided 1 answer
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