Eczema isn't an allergy, but your symptoms can get worse if you have allergies or you’re around things that cause them. Common allergens that trigger eczema can be foods like eggs, dairy products, wheat, and acidic foods like tomatoes. Dust, mold, pet dander, and pollen can cause flares, too. Try to avoid allergens or limit your time around them. Your doctor may suggest allergy testing or other ways to help.