Strong nipple sore
The nipples contains glands and similar structures just like the skin of the face. If the pores get clogged and secretions accumulate, this can become infected and manifest as pimple like growths.
The chances that this is cancer are negligible.This sounds like an infected pimple.
Try to apply warm compresses, keep the area clean, wear lose clothes and see if the pimple goes away.
If you don't see any improvement in a week or so, please consult your physician in case you need antibiotics.
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