Most skin diseases may affect the pinna in dogs and cats, but other parts of the body can also be involved.
Other than neoplasia, few dermatoses are restricted to the pinnae. Dermatoses restricted to the pinnae include aural hematoma, physical dermatoses (e.g., trauma, solar dermatitis, frostbite), arthropod bites, neoplasia, vasculitis, contact dermatitis, fissure or seborrhea of the ear margin, pinnal alopecia, and psoriasiform-lichenoid dermatitis of Springer Spaniels.
Many other dermatoses may induce lesions that begin or stay confined to the pinna for some time, but they usually involve other body sites at some point of their evolution (e.g., sarcoptic mange, dermatophytosis, atopic dermatitis, pemphigus complex).This chapter focuses on these two groups of skin diseases from the point of view of their pinnal involvement. A clinical classification based on the most common and/or particular pinnal manifestation of each dermatosis has been used. However, the author is aware that most diseases mentioned here could be included under more than one heading. The reader is referred to updated specialized literature to find details on their pathogenesis, diagnostic procedures, and treatment; they are beyond the scope of this chapter.
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