An eight-month-old boy was referred to an allergy clinic with what his family described as immediate hives after milk, soy, peanut, wheat, and egg. There had been several emergency department visits. Foods were being dropped from his diet one after another, and feeding had become a source of real anxiety at home.
Every allergy test came back negative. When allergists watched the reaction happen under supervision, they saw something that does not belong to any food allergy: redness and sweating confined to the right cheek, and nothing else.
