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

I recently observed red spots on my right boob. Is it one of the symptoms of breast cancer? - Quora

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What could this mark on my breast be? Pic included

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