The three types of allergies are parasite (fleas, mites), food allergy, and pollen/dust allergies. If your cat
is already on
a good flea control such as Advantage or Revolution, then parasites are less likely. Options to treat allergies are to continue to treat symptoms with medications (okay if symptoms only occur occasionally and your cat only needs 1-2 steroid injections per year), or to identify and treat the underlying cause.