Hi,
Thank you for posting your query.
I have noted the description of your friend's son
injury and the subsequent symptoms.
The most likely cause of his symptoms could be a
scalp hematoma, collection of blood under the skin over skull.
This is not a cause of concern, and would reduce on its own in a few days.
Pain relief medications such as
ibuprofen may be continued.
I hope my answer helps. Please get back if you have any follow up queries or if you require any additional information.
Wishing you good health,
Dr Sudhir Kumar MD (Internal Medicine), DM (Neurology)
Senior Consultant Neurologist
Apollo Hospitals, Hyderabad, India
Click on this link to ask me a DIRECT QUERY: http://bit.ly/Dr-Sudhir-kumar
My BLOG: http://bestneurodoctor.blogspot.in