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Skin: malassezia pachydermatitis

Clapis

Introduction

  • Cause:
    •  Malassezia pachydermatis  Malassezia pachydermatis  (previously Pityrosporum pachydermatisCryptococcus pachydermatis) is a frequent yet underdiagnosed cause of fungal skin disease and otitis externa in species such as the dog.
    • Considered rare in rabbits, but has been associated with other dermatological conditions in this species (found in conjunction with sarcoptic mange).
    • A novel yeast species, Malassezia cuniculisp novhas been isolated from rabbits.
  • Signs: marked multifocal areas of alopecia, crusting, dermatitis around the eye and on ears, nose, lips, neck, abdomen, feet and external genitalia has been reported in rabbits.
  • Diagnosis: cytopathology, culture and histology.
  • Treatment: treat underlying causes, topical anti-fungal therapy; rarely systemic anti-fungal therapy.
  • Prognosis: little is known about this disease in rabbits; underlying conditions must be addressed.
Print off the Owner factsheets on Malassezia pachydermatitis - yeast skin infection and Samples - how they help your vet to give to your clients.

Presenting signs

  • Multifocal areas of alopecia.
  • Crusting.
  • Dermatitis around the eyes and on ears, nose, lips, neck, abdomen, feet and external genitalia.
  • In other species, pruritus, malodor, erythema, greasy skin and lichenification.

Geographic incidence

  • Grows in warm, humid climates.

Cost considerations

  • In other species, lifelong medication may be required if underlying cause cannot be addressed.

Pathogenesis

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Diagnosis

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Treatment

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Cabañes F J, Vega S & Castellá G (2011) Malassezia cuniculi sp. nov., a novel yeast species isolated from rabbit skin.  Med Mycol 49 (1), 40-48 PubMed.
  • Negre A, Bensignor E & Guillot J (2009) Evidence-based veterinary dermatology: a systematic review of interventions for Malassezia dermatitis in dogs. Vet Derm 20 (1), 1-12 PubMed.
  • Radi Z A (2004) Outbreak of sarcoptic mange and malasseziasis in rabbits (Oryctolagus cuniculus). Comp Med 54 (4), 434-437 PubMed.

Other sources of information

  • Meredith A (2014) Dermatoses. In: BSAVA Manual of Rabbit Medicine. Eds: Meredith A & Lord B. BSAVA, Gloucester. pp 255-263.
  • Chitty J (2013) Appendix 1 - Formulary. In: BSAVA Manual of Rabbit Surgery, Dentistry and Imaging. Eds: Harcourt-Brown F & Chitty J. BSAVA, Gloucester. pp 429-431.

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