Otitis externa risk factors
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. ; Associate Editor(s)-in-Chief: Luke Rusowicz-Orazem, B.S.; Tarek Nafee, M.D. 
Risk factors for acute otitis externa include activities and conditions that predispose an individual to ear canal inflammation. Risk factors also include being a female between 65 and 74 years old. Risk factors for malignant necrotizing otitis externa include conditions predisposing an individual to immunocompromise including undergoing chemotherapy or suffering from diabetes mellitus.
- Risk factors for acute otitis externa include activities and conditions that predispose an individual to ear canal inflammation:
- Scuba-diving increases the risk of trapped water in the ear canal.
- Swimming in public pools or other unclean bodies of water increases the chance of bacterial or fungal infection.
- Living in a humid or tropical climate
- Developing dermatoses such as eczema, seborrhea, and psoriasis
- Loss of cerumen in the ear canal thins the ear canal protective coating
- Introduction of foreign objects in the ear canal such as hearing aids, or ear plugs can cause irritation and inflammation
- Ear canal obstruction such as sebaceous cysts
- Suppuration from other ear diseases such as otitis media
- Undergoing prolonged treatment with topical antibiotics raises the risk of otomycosis.
- Trauma to the ear canal
- Repeated exposure to irritants such as soaps, shampoos, or related cosmetic chemicals
- Having a narrow ear canal more prone to retaining water
- Being a female between age 65 and 74
- For malignant necrotizing otitis externa, contributors to immunocompromise include:
- ↑ "Swimmer's ear : MedlinePlus Medical Encyclopedia".
- ↑ Azizi MH (2011). "Ear disorders in scuba divers". Int J Occup Environ Med. 2 (1): 20–6. PMID 23022815.
- ↑ "Estimated Burden of Acute Otitis Externa --- United States, 2003--2007".
- ↑ 4.0 4.1 Schaefer P, Baugh RF (2012). "Acute otitis externa: an update". Am Fam Physician. 86 (11): 1055–61. PMID 23198673.
- ↑ Rowlands S, Devalia H, Smith C, Hubbard R, Dean A (2001). "Otitis externa in UK general practice: a survey using the UK General Practice Research Database". Br J Gen Pract. 51 (468): 533–8. PMC 1314044. PMID 11462312.
- ↑ "Malignant otitis externa: MedlinePlus Medical Encyclopedia".