Acute diffuse OE is the most common form of OE, typically seen in swimmers; it is characterized by rapid onset (generally within 48 hours) and symptoms of EAC inflammation (eg, otalgia, itching, or fullness, with or without hearing loss or jaw pain) as well as tenderness of the tragus or pinna, or diffuse ear edema or erythema or both, with or without otorrhea, regional lymphadenitis, tympanic membrane erythema, or cellulitis of the pinna.
For more on the background of OE, read here.
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Cite this: Russell W. Steele. Fast Five Quiz: How Familiar Are You With Otitis Externa? - Medscape - May 17, 2016.