tender lump

I have been feeling a slightly sore spot on the side of my left breast- around the area where an underwire bra would go for a few months.  I can feel it at times when my arm braushes against it or if I caary my purse under my arm.    I stopped wearing an underwire bra about two weeks ago, but the area still feels the same.  I couldn't feel anything at first- just the tender spot.  When I am in the shower, I now have been able to feel an area that I think is a lump.  It is small and feels smooth- probably oval shaped.  It seems to be movable when I run my finger over it.  It's not hard- feels somewhat rubbery.  I am trying not to feel it all the time because I might be making it worse, but it is hard to keep myself from constantly checking it.  I have a gyn appt. in April.  Do you think this might be cancer.  I am 51 years old and am past menopuase.  I am worried.  Thanks so much!

[CCF-RN,MSN-JS]

Dear pmutt, Without further evaluation it is not possible to say one way or the other what this is. It is best to have a new lump evaluated by a medical professional.