Thank you for the excellent photos. Atopic dermatitis
is most likely because of the areas that are affected - her axilla (armpit) muzzle, and face. I suspect that she has been excoriating those areas by rubbing her face on carpet and scratching her axilla with her hind leg. Atopy
describes allergies to environmental allergens such as pollens, molds, dust, and dust mites and can be addressed with a prescription corticosteroid such as prednisone or the new cytokine antagonist oclacitinib (Apoquel) which works as well as a steroid but without a steroid's adverse effects. Most of these skin lesions will be secondarily infected by bacteria and/or yeast and so it's not unusual for me to prescribe either a systemic antibiotic in the cephalosporin class such as cephalexin
for a minimum of 3-4 weeks and 1 week past clinical signs and/or ketoconazole for a month, respectively, as well. To complicate the diagnosis a bit, it's important to note that a food intolerance will cause identical symptoms. Food intolerance isn't nearly as common as atopy, however. For completeness sake, food intolerance/allergy is addressed with prescription hypoallergenic
diets. These special foods contain just one novel (rabbit, duck, e.g.) animal protein or proteins that have been chemically altered (hydrolyzed) to the point that her immune system doesn't "see" anything to be allergic to. The over the counter hypoallergenic foods too often contain proteins not listed on the label - soy is a common one - and these proteins would confound our evaluation of the efficacy of the hypoallergenic diet. The prescription foods are available from her vet. There are many novel protein foods and a prototypical hydrolyzed protein food is Hill’s Prescription Diet z/d ultra (a hydrolyzed protein diet is my preference). A positive response is usually seen within a few weeks if we’ve eliminated the offending food allergen. Food intolerance can arise at any age and even after our patient has been eating the same food for quite some time. I understand that you didn't come to the site to be told that she needs to see her vet but I don't see any alternative to getting those drugs I mentioned. Please continue our conversation if you wish.