[header] How to prevent swimmer's ear (otitis externa ) [title] Use earplugs when you go swimming. [step] Before you go into the shower at your pool, put one earplug in each ear. Mould the earplugs to your ears so that they stay in while you are swimming. 
In between swims, you should keep your earplugs dry by keeping them in a small earplug case or in a sealed plastic bag. [substeps] Get pliable earplugs from your physician's office.