Thank you for posting your query.
The hard swelling on the back of your head could be a bony growth, called as osteoma
, which is a benign tumor
. It is not a cause of concern, and can be left as it is.
However, it needs to be examined by a doctor to confirm whether that is the case, since, you have noted it for the first time.
Dr Sudhir Kumar MD DM (Neurology)
Senior Consultant neurologist
Apollo Hospitals, Hyderabad