Your pony tail?
i think if you have a bump on the back of your skull, you are getting a tumor.
There are many different things that a hard boil type knot with no core on the lower part of the back could be. It could be infection.
your skull or a rising
A creased, inward knot on the forehead is simply the result of how your skull has formed. The skull is in several pieces when a child is born, and it can achieve various common shapes.
Yes. All purebred Labradors should have a knot on the back of their head between the ears.
If it is in the back of neck, go to a chiropractor. More than likely its a sore muscle.
Could be swollen lymph nodes caused by an inner ear infection.
A doctor will be able to tell you.
VISIT A DOCTOR!
skull back moth
Knur