I have eczema and it got particularly bad and embarrassing on the back of my hand. I went on a 21 day Daniel Fast (basically vegan). Within a week or so the eczema was completely gone. Previous to this there was no OTC or prescription ointment or cream that worked at all. Now that I am off the fast it is quickly coming back. How can I figure out the source of what I feel is likely a food allergy?