Hi,
I got elbowed in the breast during a volleyball game (a few years ago so I don't remember exact details). I remember it hurt like crazy at the time but then it felt like it was bruised and was kind of hard where I got hit and it stayed like that for a few weeks at least. Maybe it took a while for a bruise to form and that's why it didn't hurt until now. I don't know if that helps, but I thought I'd share. It happenend to me, hurt like crazy for a long time but went away.
-Corrie