question: I have a pea sized hard lump in the center of my armpit.  It seems to be attached to one spot.  I can't feel it on top of the skin.   There is no pain at all when I feel of it and there is no visible sign of it.   I have had type 2 diabetes for seven years controlled by oral meds and have smoked for 30 years.  No history of cancer in family.  Should I be concerned?