Otitis externa

Last revised by Dr Avni K P Skandhan on 26 Feb 2018

Otitis externa refers to inflammation of the external ear.

Epidemiology

It is quite a common condition and may affect up to 10% of people during their lifetime.

Pathology

It can present in several forms:

Etiology

There are several known risk factors which include 1:

  • swimming
  • a humid environment
  • narrow ear canals
  • hearing-aid use
  • mechanical trauma

It may be associated with several micro-organisms. The commonest include

  • Pseudomonas aeruginosa
  • Staphylococcus aureus

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Cases and figures

  • Case 1: necrotizing otitis externa
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  • Case 2: acute otitis externa
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