I think that it's crazy so many of us have this going on right now. Mine is a large, squishy lump that is both over the bone and the muscle a little more than halfway down my shin. I did whack it over a month ago and that's how it noticed it. Looking back at pictures, I can see it so I've obviously had it quite a while and never noticed. Which is funny considering how I usually inspect my body for anything off.
It doesn't stop me from worrying about it though :/