Papules, Pustules, & Crusts Flashcards
Papule (3)
1) small solid elevation
2) up to 1 cm
3) due to infiltration of inflammatory cells & edema
Flea bite hypersensitivity*** clinical signs (6)
1) pruritus
2) erythema
3) excoriation
4) self induced alopecia
5) crusted papules
6) dorsal lumbar region most affected
Sarcoptic mange (scabies)** clinical signs (7)
1) INTENSE pruritus
2) excoriation
3) crusts
4) self induced alopecia
5) papules
6) lateral surfaces of the skin (hock, elbows, ventral abdomen)
7) alopecia and crusting of the margin of the pinna
Miliary dermatitis (crusted papular dermatitis) ** (1)
1) not a disease but a cutaneous reaction pattern associated with hypersensitivity in cats (allergies)
Pustules &/or Crust classification (3)
1) Infectious: bacterial superficial pyoderma***
2) Autoimmune: pemphigus foliaceus *
3) sterile
Superficial pyoderma (2)
1) common in dogs
2) staphylococcus pseudintermedius & staphylococcus schleiferi
Bacterial folliculitis*** (5)
1) extremely common in dogs, rare in cats
2) superficial pyoderma that affects the follicles
3) regions effected: abdomen, groin, medial thighs, axilla
4) pruritus variable
5) crusts are small
Bacterial folliculitis*** of short coated breeds (5)
1)extremely common in dogs, rare in cats
2) spontaneous alopecia
3) multifocal do not tent to expand & coalesce
4) affected areas; trunk, extremities (lateral & medial aspects
5) commonly mistaken as dermatophytosis
Bacterial impetigo (4)
1) puppy pyoderma
2) causes by certain strains of staphylococci that produce exfoliative toxins
3) affected region: abdomen
4) flaccid pustule that leads to epidermal collarettes that don’t coalesce/expand
Exfoliative superficial pyoderma *** (4)
1) lesions: large rapidly expanding epidermal collarettes, peripheral erythema, hyperpigmented center in chronic lesion
2) pustules RARELY seen)
3) pruritus variable
4) bacterial exfoliative toxins that separate the stratum corneum
Cytologic diagnosis of bacterial folliculitis (2)
1) sampling: intact pustules, beneath the crust
2) cytology: degenerate neutrophils with intracellular bacteria
Cytologic diagnosis of bacterial folliculitis of short coated breeds (1)
1) cytology may not yield degenerate neutrophils or bacteria, if it does very scant
Cytologic diagnosis of bacterial impetigo (2)
1) Sampling: intact pustules, edge of epidermal collarette
2) cytology: degenerative neutrophils with intracellular cocci, free floating epidermal cells due to separation of the stratum corneum
Cytologic diagnosis of exfoliative superficial pyoderma (2)
1) sampling: edge of epidermal collarette
2) cytology: similar to bacterial impetigo but presence of bacteria usually very scant
Treatment of localized superficial pyoderma (7)
1) topical antibacterial
2) chlorhexidine
3) benzoyl peroxide
4) dilute bleach (1:100)
5) mupirocin
6) gentamicin
7) erythromycin