"The itching is from a toxin the candida produces and involves the immune system. It means you are eating something you are allergic to or else you are off your candida diet and need to get back to it."
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Actually I've found the opposite is true. When I eat crappy food for a few days (french fries, ice cream etc) I STOP itching. Then as soon as I go full-throttle anti-candida diet I start itching again. I've decided it's my body cleansing itself because over the past year the itching has lessened to a great degree. Also I itch less after a series of enemas.
Strangely this itching is my last symptom of candida. i wish it would go away for good.