I am squeezing my memory, trying to jog it as to what people have dome for this. Here is what I remember:
One thing that someone said worked great was to take some of the parasite tincture with some olive oil (so that it covers and doesnt just absorb into the skin right away) and rub it on the affected area. Keep the stuff on there as best you can.
I remember people have said Lamisil is expensive and yes, hard on your liver.
Also, as an antifungal, onion and garlic are axcellent medicinally for this. Raw, organic. Your hubby may want to eat a few raw garlic cloves over the course of several days. The sulfites in garlic are what gives it its efficacy.
Internal cleansing is great too - liver cleanse would help and parasite cleanse.