It could mean several things, but it likely simple irritation/inflammation. If you are a lactating female, it is likely irritation of the areola due to the saliva of the nursing baby.
The most common infection is from staphylococcus aureus which can cause mastitis (warm, swollen breasts) and can lead to pus formation.
If you have any bleeding or pus coming from the nipple, seek the care of a licensed primary care provider in your area for an accurate diagnosis and treatment.
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