I have a lump on the lower back left side of my neck. It's firm but definitely not rock hard. It feels kind of rubbery, I can't tell if it's movable or not. I've been touching and pulling at it a lot which I think has made it swell up a little more. I have no other symptoms, it's painless. Can mainly only be felt when stretching my neck to the opposite side. I'm 15 and have no family history of cancers. I'm stressing like crazy!