
What Causes Numbness On The Back Of The Head Post Injury?

No cause for alarm.
Detailed Answer:
I read your question carefully and I understand your concern.
I do not think the knot on the top of the head is any reason for concern at all, at least not regarding brain injury. The brain is confined inside the thick skull, whether there is any damage to it or not it is not reflected on the outside (unless some major fracture with bone displacement with devastating damage, certainly not your case). So the knot is on the outside of the skull, between the skull and the skin, it consists on soft tissue under the skin, no brain structures at all.
As for the slower functioning .... the episode you describe of slowing down might be simply due to some anxiety after the trauma you had, hard to draw conclusions from that alone. However judging from the description of the hit you took a mild concussion is certainly possible. In such a case some psychomotor slowing is common. It usually improves gradually over the following month, rarely it lasts longer. The only treatment which is advised would be some rest, not only physical but mental as well.
So regarding your question about going to a doctor and getting a CT scan, I do not see that as necessary. The risk for threatening hemorrhages after a head injury is mostly in the first 24-48 hours, afterwards it is extremely unlikely, only rarely in the elderly or people suffering conditions which affect coagulation. So you are already well past the observation period. The headache, soreness and slowing are to be expected after a mild concussion and there doesn't seem to be any indication of a more serious injury.
I remain at your disposal for other questions.


Glad to have been of help.
Detailed Answer:
Hope you'll feel better soon.

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