Small Bump Above Sagittal Suture On Head. No Headache. Concerning?

Hello,

My name is Usman and I'm a 27 year old male.

My question is somewhat funny I believe, I worry too much I guess. Anyway here we go..

On the top of my head, just above the sagittal suture I have a small bump/lump - I have never really noticed it before yesterday therefore I'm uncertain if it has been there always.

It's in the middle of the top head. it's stone hard. I can press hard on it without any pain. I don't experience any headaches. I am in perfect health. I think it has been 5-6 years since I last saw a doctor.

I accidentally noticed it while scratching my head.

I can feel the bump if I put a finger between my eyebrows and move it in a straight line towards the back of my head, just before the sagittal suture I can feel I'm on higher ground now - Just like a reversed roller-coaster.
If I put a finger in the middle of the backside of head and move it towards my eyebrows I feel lower ground after passing the sagittal suture - Just like a normal roller-coaster.

Maybe it's not a bump after all because it feels like it's connected with the backside of my head. 

I don't know if I should worry, but I hope there's nothing to worry about.

Many thanks in advance. 

Best regards,
Usman