I get a vicious red rash between/on the underside of both my breasts whenever I wear a sports bra for more than 2-3 hours. Smothering it in coconut oil and wearing no undergarments or a regular bra takes care of the rash in a few days, but the issue is that I would love to be able to wear sports bras all day! I like going hiking and a sports bra in general is much more comfortable. I wear a "cup" style sports bra that separates my breasts, but that has not seemed to help. Any advice? Picture under cut doesn't show quite how red and irritated the skin is.