Angry rash under boob, should I worry?

Hi ladies over the last few days I noticed an increasingly irritated rash under my right boob. This has never happened to me before I’m already treating…

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Under boob rash (pic included)

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Does anybody know what these are? They hurt when touched and I didn't even realise I had them until earlier today. Is this serious? : r/bigboobproblems

What is this rash under my breast? I am currently on 40mg of accutane and I do get sweaty in this region. Is it a sweat rash? : r/Dermatology

TMI Warning! Picture included

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