I would use a mild, dilute H202 foot bath repeatedly until the problem goes away. Also consider spraying your feet with colloiadal silver and use this spray on your shoes as well. Launder your socks seperately (boiling water), run them thrugh a soak cycle with H202, and treat with some Colloidal Silver in the rinse. Let your feet "breathe" as much as possible and wear natural shoes (not synthetic).