Are you sure you're spelling this correctly. Something does not sound right here? You should call the doctor's office and ask for the prognosis again, and the spelling. I'd ask them exactly what it is. You pay them, remember. They work for you. You have a right to ask questions.
I'd also consider a second opinion...maybe a dermatologist?
Then, I would research it.
This sounds incredibly serious. I'd cut out ALL sugars and carbohydrates...don't feed the fungus. It will be important to cut out all foods that feed this problem.