What could this mark on my breast be? Pic included

I've had this red mark on my breast about 2cm to the side of my nipple. It's been there for a week. It is flat, non painless, not itchy, not hot. Perf

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Preoperative markings on the patient; the entire breast was outlined to

S - Plano Internist - Internal Medicine of Plano and Frisco

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Paget's disease of the nipple - NHS