I've had a small ball next to my left breast underneath my armpit. My mom said it was probably a muscle or something so I ignored it. Then this week I noticed a pain in my left nipple and it started getting worse and it's very sensitive. Then I also noticed that I've grown two dark moles around that nipple with more growing. My right side is completely fine. What's a diagnosis for this? What should I do? Could this be a sign of cancer?
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