Tehran University of Medical Sciences Iranian Journal of Allergy, Asthma and Immunology 1735-1502 19 2 2020 04 16 200 202 Delara Babaei Division of Clinical Immunology and Allergy, Department of Medicine, St. Michael’s Hospital, University of Toronto, Toronto, Canada AND Department of Allergy and Clinical Immunology, Mofid Children’s Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran Peter Vadas Division of Clinical Immunology and Allergy, Department of Medicine, St. Michael’s Hospital, University of Toronto, Toronto, Canada 2019 05 21 2019 11 06 Occasionally, a seemingly straightforward history of food-induced anaphylaxis may prove to be misleading.  Both patients and their physicians have a tendency to attribute the cause of an allergic reaction to the most conspicuous ingredient that had been ingested while overlooking less likely causes.  Here, we describe a patient whose history pointed to oatmeal allergy, but skin prick tests to oats and serologic testing for oat-specific IgE were negative. Ultimately, we found that the oatmeal had been contaminated with an allergenic insect, Psocid of the order Psocoptera. https://ijaai.tums.ac.ir/index.php/ijaai/article/view/2412