It is difficult for any physician to offer as specific diagnosis for the symptoms that you describe over the internet, and so I will offer some general throughts.
First of all, some women have a significant amount of breast tissue in the armpit area (axillary breast tissue). In most cases, this is a benign condition, although axillary breast tissue can develop lumps (including breast cancers) just like the breast tissue within the breast itself. Also, one can develop benign fatty tumors (lipomas) under the skin anywhere in the body, including the armpit area and in the area above the clavicles.
Enlarged lymph nodes (in the armpit area and above the clavicle) can also sometimes be felt by patients or their doctors. If enlarged, then palpable lymph nodes in these area may be due to a reaction to inflammation or infection or, much less commonly, due to cancer.
You should have the physician who does your annual "well woman" exam assess you further for these possibilities.
Sincerely/ Robert A. Wascher, MD, FACS
http://doctorwascher.com
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