So SORE, red pimples in crease under boob, anyone else? (picture)

Does anyone else have this or know what it is or why I ve got it?? It doesn t look that bad I know but it stings and burns and ALL bras rub on it. Any clue…

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weird pimple(?) on underside of right boob :( it wasn't there

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Random break out under both armpits and red bumo on breast. : r/acne