Food allergies can be serious and should always be evaluated by a physician such as a family doctor
, or in severe situations an allergist. In the case of an unidentified rash, a dermatologist
would also be a qualified physician to see your son. Food allergies typically cause symptoms such as shortness of breath, swollen lips, and an itchy skin rash known as hives. Hives tend to only appear after the allergen has been encountered, but usually are gone a short time later. They usually don't end up in the exact same location. Common culprits include peanuts, eggs, milk, seafood, and soy. Food allergies are test for by a certified allergist and include the skin prick test and the so called RAST test. I suggest that you schedule an appointment to have your son see his pediatrician
. He can take a look at the rash and determine what the etiology is. If it looks like poison ivy, they he may be prescribed a steroid cream. If it is acne, he may be given some acne medicine or get referral to a dermatologist. If the rash is diagnosed as hives, then your son may warrant a referral to an allergist for food allergy testing.