My DD has lots of food intolerances, but her eczema trigger is corn. She'll also wake up lots of times a night (and not want to go back to sleep) when she's had corn. She'll have two spots on her inner thighs that are red and raw and look like chafing (but she's potty trained so there's no diaper rubbing there or anything) and the back of her left knee (gets very itchy for her). She knows she's not supposed to have it, but sometimes one of the other kids will leave out a box of tic tacs or something and she'll get into it. Her symptoms for other foods are diarrhea, screaming all night long, drinking a ton of fluids during the day, vomiting, etc.