Food allergy rashes cause skin to become red and swollen, and it may become very itchy. Along with a red raised rash, the body may produce more mucous, which can cause an itching, burning and running nose.
According to an article published in Medical News Today, when a person eats something that the body considers harmful, the body reacts by producing antibodies that attack the protein. These antibodies cause the signs and symptoms of the food allergy. When a person has a serious food allergy, even the smallest amounts of the food can trigger a bad reaction from the immune system, and symptoms can include dizziness and respiratory problems.