Ear Margin Dermatosis
|Created by the veterinary profession for you - find out more about WikiVet|
Also known as: Canine ear margin seborrhea
Canine ear margin dermatosis is a relatively common abnormality in cornification, with lesions confined to the margins of the pinnae.
It shows marked predilection for the Dachshund and a hereditary basis is suspected. It is also present in other breeds of dogs with pendulous ears and it may be a clinical feature of hypothyroidism.
Age and sex predilections have not been noted.
Pruritus is rarely seen, in contrast with the early signs of sarcoptic mange.
There is variable alopecia, scaling, crusting and keratinous debris at the pinnal margins. The exudate can be greasy or waxy, tenacious to exfoliative and varies from yellow to brown.
A waxy seborrheic odour is often present and keratin mats the remaining hair.
Skin scrapings might rule in scabies, which is a possible differential diagnosis.
Histopathology can rule out vasculitis and provide a definitive diagnosis.
Canine ear margin dermatosis is characterised by severe hyperkeratosis, predominantly follicular. Keratin distends the follicular ostia and surrounds the protruding hair shafts to produce follicular fronds. There is usually also a variable inflammatory infiltrate including lymphocytes, plasma cells, macrophages and neutrophils.
It is an incurable condition that can be controlled through the use of antiseborrheic treatments such as benzoyl peroxide and sulfur salicylic acid shampoos as well as moisturisers.
Hard areas can be soaked in warm water, and the hair can be clipped before any shampoo is applied.
Shampooing should be performed every 24 to 48 hours until the debris is completely removed, then the frequency can be reduced to an as-needed basis.
Inflamed ears might also benefit from a topical corticosteroid cream such as 1% hydrocortisone.
In severe cases, surgical debridement might be necessary to stop the development of fissuring, and laser surgery is also helpful.
|Ear Margin Dermatosis Learning Resources|
Test your knowledge using flashcard type questions
|Small Animal Dermatology Q&A 20|
Schaer, M. (2010) Clinical medicine of the dog and cat Manson Publishing
Muller, G. (2001) Small animal dermatology Elsevier Health Sciences
Gross, T. L. (2005) Skin diseases of the dog and cat: clinical and histopathologic diagnosis Wiley-Blackwell
|This article has been peer reviewed but is awaiting expert review. If you would like to help with this, please see more information about expert reviewing.|
|WikiVetTM Introduction - Help WikiVet - Report a Problem|