Can be...: The area that you describe may NOT be an axillary (armpit) lymph node, but a piece of milk-making breast tissue that "got lost" and stayed in your armpit rather than joining with the rest of your breast. This is called "ectopic breast tissue," is very common, looks normal by ultrasound (because IT IS normal breast tissue). Ectopic tissue swells before periods. Diagram shows areas it's found.
Answered 11/14/2016
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