Thank you for posting your query.
First of all, I want to reassure you that there is very little chance of internal brain injury
in your case.
You are most likely suffering from scalp hematoma
(bleeding underneath the skin over head) and the swelling resulting from this can remain for 4-6 weeks.
So, as of now, there is no need to worry. This is especially so, as the lump has reduced from its initial size.
At present, there is no need of CT scan
Wishing you good health,
Dr Sudhir Kumar MD DM (Neurology)
Senior Consultant Neurologist
Apollo Hospitals, Hyderabad