Review Question - QID 215166

A 55-year-old woman presents with 3 months of a burning sensation and swelling in her right breast. She reports that the sensation is painful and denies any recent trauma to that area. Her past medical history is notable for hypertension, hyperlipidemia, and type 2 diabetes mellitus, for which she takes amlodipine, atorvastatin, and metformin. She has no surgical history. Today, her temperature is 37.4°C (99.3°F), blood pressure is 123/69 mmHg, pulse is 79/min, respirations are 12/min, and oxygen saturation is 98% on room air. On exam, there is noted asymmetry of the right breast with an area of erythema, warmth, and swelling around exaggerated hair follicles, as shown in Figure A. Which of the following is the most likely diagnosis?