Thank you for your photo and question. From the photo, it does not look like a fungal infection to me although we can certainly run some tests to check it. It is more likely that this is due to eczema.
Other possibilities would include an allergic contact dermatitis where she is developing the rash due to allergy to something she is coming into contact with. A quick trip to the dermatologist or doctor for appropriate creams should do the trick. Hope your wife feels better soon!
Dr Stephanie Ho, Dermatologist