Tomato pollen profilins cross-react with birch pollen, melon, watermelon, banana, citrus fruits again causing mainly mild reactions. Tomato, potato and latex all contain a protein called Patatin which can also cause allergic reactions. Symptoms of a tomato allergy · skin rash, eczema, or hives (urticaria) · abdominal cramps, nausea, vomiting, or diarrhea