Swimmer's Ear develops from prolonged contact of pool water or lake/ocean water inside the ear canal. The water causes the skin to become edematous and the pool chemicals cause inflammation and lastly skin bacteria get into the wet, inflammed skin and infection begins.
Prevention of Swimmer's Ear is best accomplished by making sure the ear canal is dry after finished swimming. Over the counter products such as Dri-Ear drops use Rubbing Alcohol to accomplish this. I generally recommend the use of a easy to prepare home remedy for prevention. Mix equal parts of Hydrogen Peroxide, Rubbing Alcohol and White Vinegar and after finished swimming place 4 to 5 drops in each ear canal. The alcohol dries the skin, the hydrogen peroxide kills germs and the vinegar decreases inflammation. This mixture should never be used if your child has ear pain or ear tubes.
Have a great summer!