Does anybody know what I can use to clear up this heat rash?

I have very large breast and whenever I go out in the heat and get to hot, I get a very painful rash under my breast. Well it's not really a rash it's more like the skin gets raw, red and very painful. I have done it again and I would really like this to be gone before surgery which is only 6 days away, August 13th. Please if you know how to heal this fast pass the information on to me quickly. Thanks so much everyone, laura

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