my cat has dermatitis. inflammed skin around face and years

I'm sorry to hear your cat is dealing with this; facial and neck inflammation is one of the most common and frustrating presentations we see. It's a classic feline "reaction pattern," which means it's a symptom, not a final diagnosis. Our job is to figure out the underlying cause.

The distribution you describe—around the face and ears—immediately makes me think of three main possibilities, which we call the "big three" for feline pruritus:

Flea Allergy Dermatitis (FAD): This is the number one cause of allergic skin disease in cats. Even a single flea bite can trigger a significant reaction in an allergic cat, and you will rarely see the actual fleas. Even strictly indoor cats can be exposed.

Cutaneous Adverse Food Reaction (CAFR): A true food allergy is a very common trigger for head and neck pruritus in cats. This is an immunologic reaction to a protein in the diet.

Atopic Dermatitis: This is an allergy to environmental allergens like pollens, molds, or dust mites.

Less commonly, we might consider things like ear mites, a skin infection (bacterial or yeast), or even an autoimmune disease like pemphigus foliaceus.

To figure this out, we need to be systematic. The first step is always to rule out parasites and infection. Your primary veterinarian can perform a simple, painless test called a skin cytology by pressing a microscope slide to the inflamed skin. This will tell us immediately if there's a secondary bacterial or yeast infection that needs treatment. An ear swab cytology is also essential.

Could you tell me a bit more?
* What flea prevention product is your cat on, and how often is it given?
* What is his current diet, including all treats and flavors?
* Is he an indoor-only cat?
* Are there any other pets in the home?

A photo of the affected areas would also be incredibly helpful for me to assess the type and pattern of the lesions. We can build a logical plan from there, but we always start by ruling out the simplest things first.