Scalp hematoma: The large knot you got when you bumped your head is called a hematoma, which is from bleeding under the skin. Often these can take quite a while to completely resolve. It is a slow steady process. It will go away eventually. The ongoing scalp pain may be as a result of superficial skin nerves being damaged. The important thing is that your brain is OK, the other things are temporary problems.
Answered 11/28/2017
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