Review Question - QID 210725

A 24-year-old woman presents to her primary care physician for unilateral breast pain. The patient states that she has been breastfeeding her son but has been experiencing worsening pain recently. Her pain is severe enough that she is now struggling to breastfeed her son with her left breast. The patient's past medical history is notable for gestational diabetes which was controlled with diet and exercise. Her temperature is 101°F (38.3°C), blood pressure is 137/69 mmHg, pulse is 100/min, respirations are 13/min, and oxygen saturation is 97% on room air. Physical exam reveals an erythematous breast with a 3-cm tender and a fluctuant mass of the left breast. Which of the following is the most appropriate next step in management?