Diseases That Affect the Pinna

The document from 2005 provides a comprehensive overview of various skin diseases that can affect the pinna in dogs and cats. It details conditions that may be confined to the pinna, such as aural hematoma, physical dermatoses, arthropod bites, neoplasia, vasculitis, contact dermatitis, and several forms of alopecia, as well as diseases like atopic dermatitis, food allergies, and autoimmune skin diseases that can also present with symptoms on the pinna. The document highlights that while some conditions may initially be confined to the pinna, they often spread to other parts of the body. Aural hematoma is specifically noted as a common issue in middle-aged or older dogs, characterized by swelling and discomfort, and is thought to be related to trauma and possibly autoimmune factors. Various treatment options are discussed for the different conditions, including surgical interventions, systemic medications, and environmental management, emphasizing the importance of treating the underlying causes to prevent recurrence. Conditions such as familial cutaneous vasculopathy, solar dermatitis, frostbite, and autoimmune diseases like pemphigus foliaceus and pemphigus erythematosus are also covered, with their respective diagnostic methods and treatments.