I also had/have this, in the same place, where the bra crosses my back.
A nodule showed up and it itches sometimes... it comes and goes
I have been to doctors that cost me thousands of dollars. They did
scans, etc. The fact is, topical treatment seems to be effective....
It can be helped with diet, but I don't trust the medical folks' error
rates enough to want anyone to dig it out. forget it. esp with all
the new infections popping up these days.
Do you have them anywhere else? Are you prone to cysts?
There can be these nodules called neuromas... they can cause
problems when they block flow to nerves... keep treating it with
whatever is effective. I wasted time and money on conventional docs...