Thank you for posting your query.
First of all, I wish to reassure you that your symptoms are not suggestive of internal brain injury
The swelling outside is due to a scalp hematoma
(bleeding underneath the skin).
As of now, there is no need to worry.
However, if you notice any of the following symptoms, you should see a doctor and get a CT scan of the brain done:
Weakness of hand or leg.
Wishing you good health,
Dr Sudhir Kumar MD DM (Neurology)
Senior consultant Neurologist
Apollo Hospitals, Hyderabad