? mastitis: This sounds like it could be a developing infection in the breast, called mastitis. Typically the lumps in the breast would also be painful, and there would also be warmth, swelling and redness. Watch for a fever. Alternatively, the lumps may be due to glandular or cystic changes in the breast. I would think with armpit involvement, your doctor may want to do further testing such as ultrasound.
Answered 12/22/2014
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