Soreness in the armpit could indicate an infection or perhaps a cebaceous cyst. I had that problem years ago and the doctor removed the cyst which was benign. Have you had a mammogram lately? I am not suggesting anything definitive here, but since you mentioned your breast, it is possible that you might have a cyst in your breast. I had one of those too. Usually when there is pain involved, the cyst is benign, but I would at least go to a doctor if you are experiencing some pain.
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