Hello from JustAnswer.
Is there any visible rash or other changes in the groin or feet?
If so, could you attach a picture of the area with the rash or visible change?
Which anti-fungal medicine was used?
I had asked for some further information and have not heard back.
If this is a fungal infection, the usual next step would be a medicine that is different than what has already been tried, but it would require knowledge of which anti-fungal has been tried.
There also are some non-medicinal treatments that may be used for fungal infection, such as tea tree oil and apple cider vinegar. These are generally not as potent as the anti-fungal medicines, but they may be able to augment the anti-fungal medicine.
It also may help to use a topical numbing medicine to ease symptoms, such as lidocaine. There are many skin products that contain numbing medicines, many of them intended for relief of other problems, such as sunburns, but if the active ingredients is lidocaine, it can be used for this purpose.
If I can provide any further information, please let me know.