Page 2449 - Cote clinical veterinary advisor dogs and cats 4th

Dermatoses, Scaling and Crusting 1212.e3

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VetBooks.ir Disease Lesions Species Signalment Lesion Frequency Pruritus Diagnosis
Distribution
−
U
Crusts, depigmentation,
Nasal planum,
Bx
Collies, Shetland
Discoid lupus
Dog, cat
erythematosus (DLE)
German short-haired
Excessive scaling
Exfoliative cutaneous erosions, ulcers Dog sheepdog, and others muzzle U Bx
Generalized
lupus erythematosus pointer
Erythema multiforme Crusts, vesicles erythema, Dog, cat Any Axillae, groin, U − Bx
target lesions, erosions, mucocutaneous
ulcers junctions
Congenital and Hereditary
Primary seborrhea Excessive scaling or Dog (cat) Onset before 6 months Generalized U − to ++, Bx
greasy skin of age; American especially
cocker spaniel and with
others secondary
infections
Ichthyosis Excessive scaling Dog Golden retriever, Generalized U Bx
Norfolk terrier,
American bulldog, and
others
Schnauzer comedo Comedones that may Dog Miniature schnauzer Dorsum C − CS, Bx
syndrome become crusted
Familial canine Alopecia, scaling, Dog Onset before 6 months Face, pressure U − Cx, Bx
dermatomyositis depigmentation of age, collie, Shetland points
sheepdog, and others
Cornification Defects Differentials, Lists, and Mnemonics
Secondary seborrhea Excessive scaling or Dog, cat Any age Depends on C − to + + + CS, any
greasy skin primary cause depending on appropriate
cause tests for
primary disease
Vitamin Marked follicular plugging, Dog Cocker spaniel and Generalized, more U − to + + CS, Bx
A–responsive hyperkeratotic plaques others; adult onset pronounced on
dermatosis ventrum
Ear margin Follicular casts and scaling Dog Dachshund and others Ear margins, U − may CS, Bx
dermatosis lateral and medial become
painful
Environmental
Solar dermatitis Erythema, scaling, may Dog > cat Light-haired animals, Pinnae, nasal C − to + CS, Bx
progress to exudation and outdoor exposure planum (cat),
crusting bridge of nose,
ventrum (dog)
Nutritional
Zinc-responsive Crusts, scales, erythema, Dog Siberian husky, Periocular, U − to + Bx
dermatosis alopecia Alaskan malamute; perioral
young adults mucocutaneous
junctions,
pressure points
Fatty acid deficiency Scales Dog, cat Any Generalized U − to + + Dietary hx
Others
Cutaneous Lesions highly variable but Dog > cat Older animals Generalized or U − to + + + Bx
lymphoma may include severe scaling localized
Granulomatous Hyperkeratosis, alopecia, Dog (cat) Young to middle-aged, Face, trunk, C − to + + CS, Bx
sebaceous adenitis follicular casts, may be standard poodle, Akita, pinnae, may
erythematous Vizsla, and others become
generalized
Otitis externa Scale, erythema, otic Dog > cat Any Pinnae, ear canal C + + Otoscopic
exudate examination,
Cyt, BC
BC, Bacterial culture; Bx, skin biopsy; C, common; CS, clinical signs; Cyt, cytology; DTM, dermatophyte test medium fungal culture; Hx, history; IDST, intradermal skin test; IgE, allergen-specific serum IgE
assay; MDB, minimum database; NSF, no significant findings; R, rare; SS, skin scraping; U, uncommon; +, positive; −, negative.
Modified from Ettinger S, Feldman E: Textbook of veterinary internal medicine, ed 6, St. Louis, 2005, Saunders.

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