Quick question about the lump...any insight would be great. It's not as soft as I thought (could also be my mind) and I noticed that when I take a hot shower, the lump felt like it was smaller...does that sound like anything familiar?
Make sure it is not just something pertaining to the skin itself.
When I was much younger (early 20's or so) I developed a lump right between my breasts. At the time I obviously didn't have HA because I kind of shrugged. It was like a little hill right in the middle of the chest, where the two bra cups meet in the front. I guess at the time I thought that any problem would be on an actual breast, not between the two - so never gave it another thought.
I left it alone and when I went to a check up years after, the nurse looked at it a bit worriedly - but then she didn't say anything.
One evening after coming out of the shower, I started to mess with it and squeezed that growth a little bit. To my shock...(sorry for the squeamish part) tons of puss started coming out of it. It was a pore that had filled with some white substance over the years (the type that usually comes out of pimples) to the point it had become like a little growth. I squeezed it all out (took forever) until the skin became completely flat in that area.
So make sure it is not a pimple or some huge pore filled with stuff.