Flea Allergic Dermatitis

Also known as:

FAD, Flea Bite Hypersensitivity, FBH, Flea Dermatosis

Diagnosis

Clinical Signs

• Mainly

dorsolumbosacral area involved, abdomen, caudomedial  thighs, flanks, 

neck of cats

• Secondary trauma is self-inflicted
• Grossly:
  • Papular

dermatitis

• • Secondary excoriations
  • Alopecic nodule if

chronic

Pathology

Grossly:

• • Papular dermatitis
  • Secondary excoriations
  • Alopecic nodule if chronic
• Microscopically:
  • Hyperplastic superficial perivascular dermatitis
  • Oedema, mast cells, basophils, eosinophils, lymphocytes, histiocytes
  • Fibropruritic nodules covered by hyperplastic epidermis

• Microscopically:
  • Hyperplastic superficial

perivascular dermatitis

• • Oedema, mast cells,

basophils, eosinophils, lymphocytes, histiocytes

• • Fibropruritic nodules

covered by hyperplastic epidermis