Girls, SOS! Allergy or diaper rash? On both sides like that. It's very…

Girls, SOS! Allergy or diaper rash? On both sides like that. It's very hot at home. There is also a little bit on the back, but smaller than the spots, just like diaper rash. Maybe from the fact that I'm constantly lying on my stomach, wants to crawl and rubs, causing irritation?