Iv had a knot on my head for a couple of years its as big as a egg don't get headache cat scan shows nothing..

Talk to your doc: Head knots can be due to many things. If it is squishy and on the outside of the skull it could be a cyst that can be easily removed. If it is hard and part of the skull it could be a benign tumor or skull overgrowth. The fact that you had a ct is good as that would show something bad like a cancerous tumor. Talk to your pmd.