Thanks for writing your query.
There seems to be soft tissue injury
of your scalp
. The goose bump is due to this soft tissue injury.
You should not worry if you donot have any other abnormal symptom.
The swelling and headache will subside by its own in few days to weeks time.
You can apply cold compress for relief from pain.
If the pain is severe, you can take pain killer like Ibuprofen
one tablet twice a day along with an antacid
If any other symptoms develop or your problem persists, get yourself examined and investigated by a Neurophysician.
I hope this is helpful to you.