Hi I am a male 54 years of age with good health. I was just diagnosed with Gynecomastia in my left breast, I have had an ultrasound and 3d imaging of both breasts and there is no signs of cancer. I also have a bit of a painful underarm on the left arm. The left breast is also painful to the touch and there is a mass under the nipple. I was also examined by my physician for swelling of lymph nodes and none were found. Blood work was done with nothing out of the ordinary. My concern is the under arm pain which seems to me increasing.