it looks like the area isn't being kept dry and might have a yeast infection or it hasn't been cleaned well enough
if it gets worse maybe check for skin infection. my son got it and since i kept trying to treat it like rash his poor bum got burned. it was like yeast infection my poor baby.
that used to happen to my daughter, doctor recommended putting lotrimin on it
It looks like she got a little too sweaty and the diaper rubbed. I'd keep it dry with baby powder after using some lotion to smooth the skin :)
I've been using Huggins and they aren't giving any burns to my son. But try parents choice brand they are a lot better
use corn starch is better than the ointments at the store imo idk. but it could be that she is allergic to the brand you're using. every kid is different to diapers. I had to use the organic cotton Huggies for my youngest.
not using buggies and no her diapers fit fine and they got past that part of her leg.
It looks like either the diaper rubbed or possibly her skin wasn't dry enough on that side after a bath.
Hopefully you aren't using huggies. I heard they have been giving chemical burns
a yeast infection on her side leg?