Small lump on the side of jaw bone?

I found a small round lump the size of a skittle or an M&M the other day when I woke up.It doesn't hurt unless I push it really hard and it moves about an inch around in any direction I push it. It's on my right side and rests right above the jaw bone so I don't think it's a swollen lymph node, and it feels relatively hard. Any ideas what this might be?