I tried to research it a bit, and all I got was that it could be a lymphnode. It's in the back of my head. I'd say behind my ear, but it's like further back between my ear and the middle of the back of my head. The whole bump (some of it is normal, I think) is about the size of my palm. I didn't notice it because it didn't bother me until last night when it felt like bruised (sort of like a goose-egg) but now it doesn't hurt anymore. But it's worrying me now.

Also, I have hypothyroidism and couldn't afford my medicine until yesterday so I hadn't been taking it for like a week. Is there any connection between the lymphnode and thyroidism?

I'd go to the Dr. But I always get sick on the weekends, and I didn't notice this until last night (fri. Night).