I have swelling under my arm about 3 to 3 1/2 inches around, this is the second time in approx 6 months, I had a mammogram which showed nothing - however this time is it painful and sore to the touch and movement -when I move my arm there is a pulling sensation and pain - the first lump was there for apppox a month = this one has now been there for 3 weeks..... there is no redness or "warmth/heat", but the pain is the difference, should I be concerned...I have no fever or other specific symptoms, I am tired but is more likely to be attributed to lack of sleep and my hours.......