The one close to my collarbone is about the size of a blueberry. When I push around on it, it seems to move away from my finger. I'm not explaining this very well...it moves back to it's original position like it is attached to the muscle.
The one at the base of my skull is about the size of a pea. It is stationary. It does not move at all. The same is true for the the one on the side of my neck.
It doesn't seem as though there is fluid inside, although I'm not sure how to tell. They are pretty hard...not like a rock, but the shape stays the same when I press on them.
They are not painful.