HELP!!! ⚠️ with BOOBS

its been real itchy for the past couple of weeks and way more itchiness on my left boob (on the top, bottom, side, and even a little where my nipple is) - i think its heat rash btw.

How do I get rid of it? Is there a cream I could use?

I’ve tried an “anti-itch” and it works for a while but the redness and itchiness still comes back

I have like 4-5 different bras I use throughout the week. I sometimes where the same one for two days max but I change mostly every single time i take a shower.