Since Sunday I have been having a pain in my right breast. It seems to be in one location, underneath on the outer right side. I can't seem to locate the specific spot with massage, it must be very deep in the tissue. I have no pain while nursing. I thought this might have started because I wore an underwire on Sunday, but it is not going away. The pain is most noticeable when I bend over or have my bra off. I have never had any infections, and I have only had moderate fullness lately no engorgement. What could this be?