Give your baby more diaper free time and clean that area with warm water apply some coconut oil.  Check with your doc as soon as possible.

if you keep the area open babies touch them frequently...the weather is too hot hope you're keeping the baby hydrated and changing her diapers on time... keep the baby clean and use baby products only.... cotton baby clothes..... clean her nappy area with wipe or wet cotton cloth at each diaper change....if you see any redness or her urine color is pale then consult her pediatrician....

hi anon hw old is she? is it red? pls wash with warm water and show a dr if she continues to be distressed. what is her pee count?