Felis ISSN 2398-2950

Malassezia dermatitis

Contributor(s): David Godfrey, Rosanna Marsella

Introduction

  • Rarely recognized but probably is underdiagnosed.
  • Cause: not definitely known but Malassezia pachydermatis Malassezia pachydermatis and Malassezia sympodialis are suspected to be the usual pathogens. It may often be a complication of another dermatosis.
  • Signs: otitis externa, seborrheic dermatitis.
  • Diagnosis: cytopathology.
  • Treatment: topical and or systemic antifungal agents.
  • Prognosis: good unless severe underlying condition. Recurrence is common if underlying cause is not identified.
    Print off the owner factsheet on Malassezia Malassezia to give to your client.

Pathogenesis

Etiology

  • Probably overgrowth of commensal organisms (Malassezia pachydermatis  Malassezia pachydermatis and Malassezia sympodialis due to factors altering the skin surface microclimate.
  • Possibly (but this is untested) underlying immunosuppressive condition may be involved, eg diabetes mellitus Diabetes mellitus, neoplasia, feline immunodeficiency virus Feline immunodeficiency virus, allergies, endocrinopathies and genetics.

Predisposing factors

General

  • Genetic predisposition.
  • Immunosuppression.

Specific

Pathophysiology

  • Based on conjecture and data from other species.
  • Probably increased number of organisms lead to a cutaneous inflammatory response.

Timecourse

  • Weeks to months.

Epidemiology

  • Probably unknown factors   →   changes in the skin surface microclimate and possibly decreased skin defenses.
  • Factors that increase skin surface moisture such as drooling and food contamination may be involved.

Diagnosis

This article is available in full to registered subscribers

Sign up now to purchase a 30 day trial, or Login

Treatment

This article is available in full to registered subscribers

Sign up now to purchase a 30 day trial, or Login

Prevention

This article is available in full to registered subscribers

Sign up now to purchase a 30 day trial, or Login

Outcomes

This article is available in full to registered subscribers

Sign up now to purchase a 30 day trial, or Login

Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Morris D O (1999) Malassezia dermatitis and otitis. Vet Clin North Am Sm Anim Pract 29 (6), 1303-1310 PubMed.
  • Godfrey D R (1998) A case of feline paraneoplastic alopecia with secondary Malassezia-associated dermatitis. JSAP 39 (8), 394-396 PubMed.
  • Forster-van Hijfte M A, Curtis C F, White R N (1997) Resolution of exfoliative dermatitis and Malassezia pachydermatis overgrowth in a cat after surgical thymoma resection. JSAP 38 (10), 451-454 PubMed.
  • Bond R, Anthony R M, Dodd M et al (1996) Isolation of Malassezia sympodialis from feline skin. J Med Vet Mycol 34 (2), 145-7 PubMed.

Other sources of information

  • Mason K V (1997) Malassezia pachydermatis-associated dermatitis. In: Consultation in Feline Internal Medicine 3rd edn. Ed J R August. Philadelphia: W B Saunders. pp 221-223, ISBN 0 7216 5814 8.


ADDED