Otitis externa

• External ear canal
  • Outer third is cartilage, inner 2/3 is bone
  • Thin keratinized stratified squamous epithelium
  • Contains ceruminous glands -> produce cerumen
  • Diseases
    • Swimming, Q-tip use, scratching
    • Acute
      • Diffuse otitis externa
      • Circumscribed otitis externa
      • Bullous otitis externa
    • Chronic
      • Necrotizing otitis externa (pseudomonas)
      • Eczema
      • Fungal infection (otomycosis)
      • Cholesteatoma
  • Symptoms
    • Otorrhoea
    • Pain
    • Conductive hearing loss‎