Section: Information In-depth
Other medical problems can lead to symptoms similar to those encountered in otitis externa. It is important to exclude these conditions before establishing a definite diagnosis. Examples are:
Atopy. Fifty-five percent of dogs with itchy skin disease caused by an allergy have otitis externa.
Autoimmune disease, such as systemic or discoid lupus erythematosus or pemphigus
Contact allergy
Demodicosis
Endocrine imbalance
Food allergy
Foreign bodies such as foxtail awns
Ear disease like cancer, hyperplasia or polyps
Parasites like ear mites, which are responsible for 10 percent of otitis in dogs
Polyps
Sebaceous adenitis
Seborrhea
Trauma
Tumors. The following have been reported: squamous cell carcinoma (more common in cats than dogs), histiocytomas, sebaceous gland adenomas, adenocarcinomas, basal cell tumors, mast cell tumors, chondromas, chondrosarcomas, trichoepitheliomas, apocrine gland adenomas, fibromas, fibrosarcomas, and papillomas
Zinc-responsive dermatosis
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