I have exactly the same. I had my usual freakout about it last year, or maybe two years ago, but it hasn't grown since so I've let it go. Stop touching it for a couple of weeks, it will get a little bit smaller, but it will probably still stay there. It's probably a lymph node that is very slightly enlarged, but since it's not growing and it's moving, it's probably harmless.
I read somewhere that a lymph node has to be bigger than 1 cm to be suspicious... I think mine is about 0.9 cm