Canis ISSN: 2398-2942

Skin: malassezia disease

Synonym(s): Malassezia pachydermatis, Pityrosporum canis (past)

Contributor(s): Ross Bond, Rosanna Marsella, Ian Mason, Charlie Walker

Introduction

  • CauseMalassezia pachydermatis Malassezia pachydermatis (previously Pityrosporum canis) is the most frequent and commonly diagnosed cause of fungal skin disease, which also has a role in secondary infection in otitis externa Skin: otitis externa
  • Defective cutaneous defence may allow infection to occur Skin: bacterial skin disease - overview.
  • Signs: pruritus, erythema, alopecia, greasy, malodorous skin, lichenification.
  • Diagnosis: cytopathology.
  • Treatment: antifungal therapy and control of primary cause.
  • Prognosis: good, lifelong therapy may be required. Recurrence is common if underlying cause is not identified.
    Print off the owner factsheet on Malassezia Malassezia to give to your client.

Pathogenesis

Etiology

Predisposing factors

General

  • Breed.
  • Underlying disease.
  • Hypersensitivity disorders.

Specific

  • Steroid therapy.
  • Antibiotic therapy.

Pathophysiology

  • Unclear.
  • Normal skin is resistant to M. pachydermatis infection.
  • Primary cause +/- genetic factor → lowered skin resistance → spread of organism from normal reservoirs (anal mucosa, lips, ears) → clinical disease Skin: bacterial skin disease - overview.
  • Hypersensitivity to Malassezia has been reported in atopic dogs. Thus increased number is not necessary to cause disease.

Timecourse

  • Variable.

Diagnosis

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Treatment

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Outcomes

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Bond R, Morris D O, Guillot J et al (2020) Biology, diagnosis and treatment of Malassezia dermatitis in dogs and cats. Clinical Consensus Guideline of WAVD. Vet Dermatol 31, 27-4e PubMed.


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