When my husband and I went on vacation last month, we ate at every restaurant in the small resort town that we stayed in. Later that evening I had a rash on my face, and my mouth itched. I took some antihistamine, and it went away, but I wondered what could have caused it. I went online and looked at the possible causes of these strange allergy symptoms, and I was able to pinpoint them to some food I had eaten. I was relieved to know exactly what had caused it, and now I am very careful when I am ordering food in a restaurant.