Cats can also be allergic to indoor allergens like mold, dust, household mites, etc. Indoor allergies are indistinguishable from outdoor allergies, except that the licking, biting and scratching is often year-round rather than seasonal right from the start. Your veterinarian or a veterinary dermatologist can determine if your cat has indoor allergies using an intradermal (skin) or blood test.
To reduce your cat’s exposure to indoor allergens, deal with any mold problems in your home, clean frequently and thoroughly, use air filters, and regularly bathe or wipe your cat’s coat with a damp cloth. Veterinarians can also prescribe fatty acid supplements, anti-histamines, hyposensitization therapy, immunosuppressive drugs and other treatments to help manage symptoms in cats with indoor allergies.