Breast infections can present as localized abscesses, mastitis, mammary fistulas, or infected hematomas/seromas. Staphylococcus aureus and streptococcal species are common bacteria that cause breast abscesses, while S. aureus is most frequently responsible for mastitis infections originating from nursing children. Treatment involves analgesia, antibiotics, and potentially drainage procedures like ultrasound-guided aspiration or incision and drainage surgery.