Diaper rash

Nikole
Baby is 5 & a half months old and is teething so she is pooping about 5 times a day because she's been pooping so much she's developed a diaper rash I'm letting it air dry after I changed her diapers and I'm putting the stand on it and also Aquaphor sometimes and nothing is clearing it up it seems like it's getting worse any advice on what could help.