Girls, what could it be? We only have diapers for walks (always dry) a…

Girls, what could it be? We only have diapers for walks (always dry) and at night. I've smeared them with everything I can find (we'll see a doctor in 3 days, but I can't anymore... the child is not bothered by anything, more than me. Also near the anus there is red. Maybe someone had this too.