How do warm and humid conditions increase the risk of outer-ear canal infections?

Warm and humid conditions significantly increase the risk of external otitis—commonly known as swimmer's ear—by creating an environment that promotes the growth of bacteria and molds within the external auditory canal.12

When the ear canal is exposed to a warm, damp environment, moisture can become trapped inside. This excess moisture, often exacerbated by excessive perspiration or activities like swimming and diving, compromises the skin of the ear canal. The resulting dampness provides an ideal breeding ground for microorganisms, which can lead to inflammation, itching, swelling, and potential infection.231

To manage or prevent these infections, it is important to keep the ear canal dry and avoid activities that introduce water into the ear. If symptoms such as pain, discharge, or hearing impairment occur, professional medical cleaning and the use of prescribed antiseptic or antibiotic eardrops are typically required to resolve the condition.14