64 BASICS
Pythiosis: animals exposed to stagnant water, ulcerative nodules, severe pruritus.
Protothecosis: saprophytic algae, stagnant water, ulcerative MCJ, depigmentation.
Paecilomycosis: saprophytic yeast-like fungus; decaying vegetation; ulcerative nod-
ules and otitis externa.
Leishmaniasis: protozoan parasite, zoonotic disease, exfoliative, crusting, ulcerative
dermatosis (Figure 6.77).
Feline cowpox: rare, cats become infected via bite wound, Europe, ulcerated papules
and nodules.
FeLV- and FIV-associated dermatoses: giant cell dermatosis (ulcerative, pruritic; face,
neck, pinnae) and FeLV vasculitis of the pinnal tips and tail (Figure 6.78).
Feline calicivirus-associated dermatoses: feline orofacial pain syndrome (trigeminal
neuralgia, unilateral facial pruritus – Siamese and Burmese).
Demodicosis: severe generalized cases become crusted and ulcerative.
Sarcoptid mites: severe pruritus induces generalized excoriation and crusting.
Flea bite hypersensitivity: caudodorsal trunk.
Feline mosquito bite hypersensitivity: lesions are facial, erythematous, and ulcerative
nodules (Figure 6.79).
Pelodera and hookworm migration: erythema, ulceration; footpads, ventrum.
Feline eosinophilic granuloma complex: indolent ulcer, linear granuloma,
eosinophilic plaque (Figure 6.80).
Allergic dermatitis: severe pruritus causes erosion, ulceration, crusting (Figure 6.81).
Dermatomyositis: hereditary ischemic dermatopathy; face, ears, tail; megaesophagus,
muscle disease/atrophy, dropped gait.
Epidermolysis bullosa aquisita: young Great Danes (most common); urticaria, vesi-
cles, ulcers – face, groin, footpads, oral cavity, mucocutaneous junctions (Fig-
ure 6.82).Cutaneous asthenia: skin hyperextensibility and fragility; both dogs and cats; ulcera-
tions and scarring.
Cutaneous xanthoma: cholesterol clefts in the dermis; yellow-pink alopecic plaques
and nodules that tend to ulcerate, often associated with diabetes or idiopathic hyper-
lipidemia (Figure 6.83).Drug eruption (Figure 6.84).
Superficial necrolytic dermatosis (hepatocutaneous syndrome): hyperkeratotic ulcer-
ative dermatosis associated with liver disease and/or pancreatic glucagonoma.
Calcinosis cutis: mineral deposits within the dermis associated with collagen degen-
eration induced by corticosteroid administration or hyperadrenocorticism; intense
pruritus, erosion, ulceration (Figure 6.85).Epitheliotropic lymphoma: depigmentation, scale, plaques, nodules, and ulceration;
slowly progressive; dogs and cats (see Figure 6.50).
Ulcerative dermatosis of collies and shelties: may be variant of dermatomyositis or a
vesicular cutaneous form of lupus erythematosus; serpiginous erythema with flaccid
bullae that ulcerate; groin, axillae, genitalia, pinnae, oral mucosa, footpads.Feline ulcerative linear dermatosis: solitary lesion over neck and shoulder region,
intense pruritus, refractory to therapy.