Hi everyone. I have noticed to hard pretty immovable lumps on the back of my head. One on the left and one on the right pretty much in identicle positions.

They are 3 quarters the way down my head one on the left and one on the right.

I vaguely remember feeling them about 4/5 years ago but I'm not sure if they are slightly better (my hair is a LOT shorter now tho.)

My mum also ahs them in the same places to an extent but they are not as large.

I'm hoping it's just bone.

Could it be anything sinister