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Staphylococcus is a bacteria that normally resides on the surface of our skin, without causing any specific harm. However, if there are some form of break or tauma in the skin area (or cracks in the nipples from whatever cause), this can result in that bacteria translocating inside the breast and causing an inflammatory process, hence, an infection.
In your situation, it is important to keep your nipples, clean, and moisturized to avoid skin cracking. Also, ask your doctor about the possibility of other diagnoses aside from staph infection such as breast duct papilloma, which can present with bloody nipple discharge.
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