La otitis externa (también conocida como "Oído de nadador") es una inflamación del conducto auditivo externo (CAE), debida generalmente a una causa infecciosa. Junto con la otitis media, la otitis externa es una de las dos condiciones humanas comúnmente llamados "dolor de oídos". También ocurre en muchas otras especies. La inflamación de la piel del canal auditivo constituye la esencia de este trastorno. La inflamación puede ser secundaria a la dermatitis (eccema) solamente, sin la infección microbiana, o puede ser causada por una infección bacteriana o fúngica activa. En cualquiera de los casos, pero más a menudo con la infección, se inflama el conducto auditivo y puede haber dolor o sensibilidad al tacto. La otitis externa de origen bacteriano se divide en cuatro tipos: \n* OE aguda circunscrita o forúnculo del conducto auditivo externo no interno \n* OE aguda difusa lo cual se duda \n* OE crónica \n* OE invasiva o maligna \n* Es la infección que se presenta en la piel y en los tejidos blandos del conducto auditivo externo en la vecindad con el pabellón auricular. Algunos síntomas de la otitis son: inflamación, infecciones virales, dificultad al escuchar, dolor, fiebre; entre otros. El tratamiento consiste generalmente en antibióticos y analgésicos.

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Otitis externa, also known as swimmer's ear, is an inflammation of the ear canal. It often presents with ear pain, swelling of the ear canal, and occasionally decreased hearing. Typically there is pain with movement of the outer ear. A high fever is typically not present except in severe cases. Otitis externa may be acute (meaning less than six weeks) or chronic (meaning more than three months) in duration. Acute cases are typically due to a bacterial infection while chronic cases are often due to allergies or autoimmune disorders. Risk factors for acute cases include swimming, minor trauma from cleaning, using hearing aids or ear plugs, and other skin problems like psoriasis or dermatitis. Those with diabetes are at risk of a severe form of disease known as malignant otitis externa. Diagnosis is based on the signs and symptoms. Culturing the ear canal may be useful in chronic or severe cases. Acetic acid ear drops may be used as a preventative measure. Treatment of acute cases is typically with antibiotic drops such as ofloxacin or acetic acid. Steroid drops may be used in addition to antibiotics. Pain medications such as ibuprofen may be used for the pain. Antibiotics by mouth are not recommended unless the person has poor immune function or there is infection of the skin around the ear. Typically improvement occurs within a day of starting treatment. Treatment of chronic cases depends on the cause. Otitis externa affects 1-3% of people a year with more than 95% of cases being acute. About 10% of people are affected at some point in their life. It occurs most commonly among children between the ages of seven and twelve and among the elderly. It occurs with near equal frequency in males and females. Those who live in warm and wet climates are more often affected.

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