 [ Symptoms ] what happens if you eat fudge with white mold on it [ Disease ] rash can be caused by a food allergy even though your son is diet has not changed does not mean he can not develop a food allergy or maybe he is now eating more of something he ate little of before so to be sure write down what he ate prior to his rash if you think there is a link between something he ate and the rash let his doctor know here are common food allergies good luck