Hello! I know exactly what your mom has as I have it too. I get a smooth red rash (very strong infection smell) under my left breast and in the folds of my inner thighs. I don't know what causes it. I do believe that sweat makes it worse but I don't think it's the cause. I've also used talc and neosporin to at least control the itching/discomfort but have been actively searching for the cause. It's partial what brought me here.
I don't tend to have a lot of yeast issues (that I know of) so I've never even considered candida. I'll have to research that a bit.
I just began taking ACV and honey 3 times a day. If that helps I will most definitely let you know.