red rash under breasts

Hi just been to have a wash and noticed this red rash under both breasts. I have got sweaty today and walked a lot. Don't know if it is that. Have a a

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Rash under breast

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Heat Rash During Pregnancy

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

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