Perhaps not today, but eventually.
I have this thing on my back...no, not there, left side, up above the shoulder blade.
It's been there for about three years and I'm thinking of getting it looked at. Can't be too careful.
I've also found that my left trapezius muscle is bigger, more developed than my right even though I'm right-handed (right dominant if you want to be naughty).
I've got to work on that.