Tomatoes are high in salicylites and acid. I have found Jovie to be quite sensitive to them, so we don't eat more than 1 tomato based meal a week. Salicylites (sp?) are natural preservatives, but people with food allergies or intolerances are known to react to them if they have too much. I expect the skin rash would be due to the acid content, but like Maz's little man, sometimes they are too much to digest early on as well.