Allergies to pollens and other things in the world manifest in cats and dogs as skin itching. Unlike people who get sneezing and runny nose and eyes cats and dogs ears and skin become itchy and inflamed. They often will pull out the hair in the area and chew and scratch their skin bloody. Often this is confused for mange or fleas. Although these other problems must be ruled out, the number one cause I see is seasonal pollen allergy. Often we can treat this with short-term low-dose corticosteroids. If it’s not too severe an attack antihistamines often work with less side effects than steroids.