CHAPTER 6 SYMPTOM CHECKER (LESIONAL AND REGIONAL DERMATOSES) 65
Feline plasma cell pododermatitis: metatarsal and metacarpal pads, swollen and
spongy, ulcerative; may be FIV associated (Figure 6.86).
Idiopathic nodular panniculitis: subcutaneous nodules and draining tracts over the
trunk; dachshunds predisposed, dorsum often more severely affected, lesions are ster-
ile, heal with crusting and scarring (Figure 6.87).Erythema ab igne: radiant heat damage (Figure 6.88).
Actinic dermatitis: erythema and scaling that progresses to nodules/erosion/
ulceration; lightly pigmented skin predisposed.
Solar, thermal, chemical burns: erythema, scale, erosion, ulceration, necrosis (Fig-
ure 6.89).
Acral mutilation syndrome in springer spaniels: severe ulceration of extremities; self-
induced, hereditary sensory neuropathy.
PIGMENTARY ABNORMALITIES
Idiopathic leukoderma/leukotrichia (vitiligo): skin and hair affected; Belgian shep-
herds, German shepherds, dobermans, rottweilers predisposed; can be permanent or
wax and wane (Figures 6.90, 6.91).Canine uveodermatologic syndrome (Vogt Koyanagi Harada-like syndrome): panu-
veitis, leukoderma, leukotrichia, meningoencephalitis; immune-mediated attack on
melanocytes; huskies and akitas predisposed (Figure 6.92).Nasal hypopigmentation (Dudley nose – permanent, snow nose – transient): idio-
pathic; cobblestone texture of the planum nasale retained.
Epitheliotropic lymphoma: mucocutaneous junctions are often depigmented (Fig-
ure 6.93).
Discoid lupus erythematosus: depigmentation and ulceration of the planum nasale
often clinical features (Figure 6.94).
Systemic lupus erythematosus, bullous pemphigoid, pemphigus vulgaris, pemphigus
erythematosus: immune-mediated diseases that affect the dermoepidermal junction
region of the skin (melanocyte collateral).Dermatomyositis: collies and shelties; scarring dermatosis, megaesophagus, dropped
gait, muscle weakness, depigmentation of skin and coat.
Drug-induced pigment changes: ketoconazole induces graying of the coat.
Lentigo: asymptomatic patches of black pigment in older dogs and orange cats; lesions
are flat macules, hypermelanosis (Figure 6.95).
Postinflammatory hyperpigmentation: normal response of the skin to inflammation,
indicative of the healing process.
Color dilution alopecia (color mutant alopecia): associated with blue or fawn coat
colors.
Melanoderma and alopecia of Yorkshire terriers: alopecia, shiny skin, hyperpigmented
skin.
Macular melanosis: associated with testicular neoplasm.