Flea allergy: A single flea bite can trigger an exaggerated immune response in cats. Usually, it’s the flea’s saliva that their immune system doesn’t like. Cats with a flea allergy can develop anemia, a potentially life-threatening complication.

Environmental allergies: The most common environmental triggers are pollen, dander, dust, and mold spores. Your cat's immune system can flare up when these substances land on her fur, paws, or ears and work their way into the skin.

Food allergies: Some cats are allergic to certain proteins in their food. Chicken and fish are the usual culprits.

Ringworm: This fungal infection has nothing to do with worms, but it is itchy and unpleasant for your kitty. Your cat’s hair, nails, and skin can all be affected by this fungus, which causes flaky red lesions and fur loss.

Feline miliary dermatitis: This condition starts out as a rash that develops in response to a food, flea, or environmental allergy. It can turn into a painful skin infection that produces pimple-like lesions on your cat’s skin.