Allergy is #1 suspect, as well as yeast inbetween the toes. If its yeast, advice would be to take some monistat (yes, ladies yeast cream) and use inbetween the toes. Also you can bathe feet in selson blue shampoo (medicated to stop the itch) or use some apple cider vineagar on them. If is yeast, that should get it, if its food allergy then it will come back and then may look to switch foods.
Good Luck!
Good Luck!