I have a hard lump on my right shoulder, under my right armpit, and on the right side of my jawbone. I asked the doctor about the lumps on my shoulder and armpit, and she replied that is was my lymph nodes and that I should have a mammogram. I am concerned about this because my sister had lymph nodes that were swollen for a month or more, like myself, and she ended up having cancer. I have experienced weight loss (20+ pounds in a couple of months), however, I have recently been diagnosed with diabetes as well.