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.
Enlarged lymph nodes with weight loss can be due to cancer or chronic infections. A mammogram is recommended. If a lesion is detected in breast, its fine needle aspiration cytology (FNAC) should be done. Otherwise, FNAC of enlarged lymph node may lead to diagnosis.