About two years ago, while I was putting it up, I noticed a lump on the back of
. It is under my hair, almost at the hair line, on the left side of
on what feels like the left muscle of the spine, at the base of the skull.
I hadn't thought of it in a while, but more recently I have been getting massive debilitating migraines. That's why I decided to ask a question here. It is about the size of a dime, maybe slightly smaller.