This patient support community is for discussions relating to breast cancer, biopsy, genetics, chemotherapy, hormone therapy, lumps, lumpectomy, lymph node dissection, lymphedema, mammograms, mastectomy, radiation therapy, reconstruction, and self exams.
Do the biopsy to be sure. It's really the only way to know for sure.
Be your own advocate, find a doc who is listening. Even if you turn out to be wrong, at least you will know and it will be documented on what it was.