Should your cat experience an allergy to lavender, your veterinarian may recommend shampoo or ointment that contains hydrocortisone. These will help with the swelling and skin irritation that your cat is experiencing. Antihistamines do not work to alleviate symptoms in all cats, however, they are an easy option to try in order to help your cat get relief. Corticosteroids are typically very effective in reducing the allergy symptoms, although they do cause serious side effects (particularly when used over the long term) and are usually only recommended as a treatment upon other options not being successful. Should your veterinarian recommend corticosteroids, side effects in short term treatment tend to be minimal (diarrhea, increased thirst). Long term use of corticosteroids can lead to your cat developing problems with his liver as well as diabetes. When your cat is being treated with corticosteroids, your veterinarian will likely monitor his blood chemistry levels in order to catch any problems as they develop.
Allergies & Atopy in Cats - Pet Education
These tips and measures are for support only and do not replace the specific treatment recommended by your veterinarian. If the condition is a simple cat skin allergy, it should be resolved by these measures, otherwise your cat needs proper medical attention and a specific treatment after reaching a confirmed diagnosis.
Allergy & Atopy Treatment in Cats - Pet Education
"Cat skin allergies have multiple causes including parasites such as fleas, atopy or inhaled allergens, skin contact irritants and food allergy. Determining the cause starts a review of where and how the condition manifests itself on the skin. Location and pattern of hair loss are important clues as to the possible underlying cause. A veterinarian will eliminate potential triggers one by one until a specific diagnosis is reached. The first step is to eliminate fleas, since this is the leading cause. If a cat is on a flea preventative, the Vet will look for signs of food allergy, contact allergens in areas with less hair such as the abdomen, face, feet and neck, and food allergy. Treatment involves eliminating the allergic trigger such as changing the cat's diet or treating for fleas. If allergy is eliminated as the cause of a skin problem, other autoimmune conditions such as pemphigus are considered."
Allergies and Atopy in Cats - Drs. Foster and Smith