Canis ISSN: 2398-2942

Skin: black hair follicle dysplasia

Contributor(s): David Scarff, Susan E Shaw

Introduction

  • Rare disorder.
  • Cause: idiopathic.
  • Signs: dogs with bicolor and tricolor coats develop alopecia of black-haired areas:
    • Black areas become bald.
    • White hairs remain normal.
  • Diagnosis: clinical signs, histopathology.
  • Treatment: lifelong treatment of alopecic areas.
  • Prognosis: good, although alopecia will not resolve.

Pathogenesis

Etiology

  • Idiopathic, possible deficiency in melanocyte-stimulating hormone or coat color genetic influence.

Pathophysiology

  • Idiopathic.
  • Disorders of pigment transfer and abnormalities of hair cuticle (macromelanosome production).
  • Brittleness leads to fracture and loss of hair.
  • Altered skin function may lead to bacterial infection.

Timecourse

  • Alopecic areas persist throughout life.

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.
  • Kuhl K A (1996) Newly reported skin diseases. Vet Med 91 (11), 1007-1020 VetMedResource.
  • Lewis C J (1995) Black hair follicular dysplasia in UK bred Salukis. Vet Rec 137 (12), 294-295 PubMed.
  • Hargis A M et al (1991) Black hair follicular dysplasia in black and white Saluki dogs: differentiation from color mutant alopecia in the Doberman Pinscher by microscopic examination of hairs. Vet Dermatol 2 (2), 69-83 VetMedResource.

Other sources of information

  • Scott D W, Miller W H & Griffin C E (1995)Small Animal Dermatology.5th edn. Philadelphia: W B Saunders. ISBN 0 7216 4850 9.
  • Yager J A & Wilcock B P (1994)Color Atlas and Text of Surgical Pathology of the Dog and Cat.London: Wolfe Publishing, Mosby Year Book Europe. ISBN 0 7234 1827 6.
  • Gross T L, Irkhe P J & Walder E J (1992)Veterinary Dermatopathology.St Louis: Mosby Year Book. ISBN 0 8016 5809 8.


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