since when you have this dent?
where is dent exactly?
on top ,like a dent for new borns
you menas bones?
which part of head you have dent?
on top the exact part where new babies head is soft
you moticed this dent last wk ? Is there any history of trauma to head?
Any other medical illness?
How big is the dent?
Is there any pain?
no pain size of a coin
how deep is depression?
a little dip to see the uneveness
are you sure it was not there previously?
maybe but i just noticed when i shaved my head.
This can be just deformity of skull bone which can be harmless.
Other possibilty is some lesion of skull bone like infection , tumor or due to metabolic disease.
To be on safer side you should get examined by your doctor.
X-ray of skull bone is also required.
If there something positive on x-ray you might require ct or mri.
I HOPE THIS HELPS.
PLEASE ACEEPT ANSWER