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Archive Case #130: Avian Scaly Face Mite Infestation

Bird veterinary case - Easy - July 11, 2026

Clinical Clues

  1. A budgerigar is presented for slowly progressive crusting of facial skin.
  2. The owner reports itchiness and a gradually changing beak shape.
  3. Similar crusting and thickening are visible on the legs.
  4. Lesions are dry, proliferative, and honeycombed.
  5. The disease is caused by burrowing mites in superficial skin.
  6. Knemidokoptes scaly face mite infestation causes crusting of the cere, beak, and legs in budgerigars.

Diagnosis

Avian Scaly Face Mite Infestation

This case is most consistent with Avian Scaly Face Mite Infestation because the budgerigar has classic proliferative crusting of the cere, beak, and legs. The most important clues are the species and lesion pattern, which make a simple traumatic beak injury less likely.

Learning review

Review the case evidence

Use the paired clues to explain how the evidence in this bird case supports the provided diagnosis, Avian Scaly Face Mite Infestation, then compare your reasoning with the case explanation.

Evidence checkpoints

Clues 1-2

  1. Clue 1: A budgerigar is presented for slowly progressive crusting of facial skin.
  2. Clue 2: The owner reports itchiness and a gradually changing beak shape.

Clues 3-4

  1. Clue 3: Similar crusting and thickening are visible on the legs.
  2. Clue 4: Lesions are dry, proliferative, and honeycombed.

Clues 5-6

  1. Clue 5: The disease is caused by burrowing mites in superficial skin.
  2. Clue 6: Knemidokoptes scaly face mite infestation causes crusting of the cere, beak, and legs in budgerigars.

Self-review prompts

  1. After clues 1-2, what evidence from this bird case shaped your initial interpretation?
  2. When you compare clues 3-4 with clues 1-2, what changed in your reasoning about Avian Scaly Face Mite Infestation?
  3. How do clues 5-6 align with the case explanation for Avian Scaly Face Mite Infestation?

Educational Use

Vetdle archive cases are educational veterinary games for diagnostic reasoning practice. They do not provide veterinary advice, diagnosis, treatment, or professional medical guidance.