chafed butt cheeks?

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Hey ladies, I'm 32 weeks and wanting to know if I'm really the only one experiencing chafed butt cheeks? Haha, it's summer here in Australia and that combined with the extra blood flow and all the sweating I do when I'm sleeping each night has seen me wound up with very itchy and irritated butt cheeks this past week. It's soooo uncomfortable? Anyone out there experiencing the same thing? And what do you use to help/alleviate that uncomfortable itchiness and tenderness?