I have it in between and starting to go under my breasts and I think it is from the sports bras I used to wear all the time because I practiced volleyball every day. I don't go in the sun much now and they're there. They also don't itch and no matter what I do, I can't wash the spots off without making my skin raw and red instead of the brown spots. So it's not dirt. So, I'm pretty sure it is just a result of wearing a sports bra too often or any bra that pushed your boobs together.
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