What is the recommended preventive measure for otitis externa?

Maintaining ear dryness post-swimming is the recommended preventive measure for otitis externa, commonly known as swimmer's ear. This condition arises from bacterial infection in the outer ear canal, often exacerbated by moisture. When water remains trapped in the ear canal, it creates an environment conducive to the growth of bacteria and fungi, increasing the risk of developing otitis externa.

To effectively prevent this condition, keeping the ear dry after swimming is crucial. Simple measures include using earplugs while swimming, tilting the head after swimming to allow any trapped water to drain, and using a towel to gently dry the outer ear. These practices help minimize moisture exposure and thus reduce the risk of infection.

Other options, while they may relate to the management of otitis externa once it occurs, do not address prevention as directly. The application of topical antibiotics is typically used as a treatment after the infection has developed rather than as a preventive measure. Oral analgesics can provide pain relief for existing discomfort but will not prevent the occurrence of the condition. Prolonged use of cotton swabs can actually increase the risk of injury and disrupt the natural barrier function of the ear canal, making it more susceptible to infection rather than preventing it.