Swimmer's ear, also known as otitis externa, is an infection of the outer ear canal. Symptoms can include itching in the ear canal, redness inside the ear, discomfort or pain, fluid drainage, and a feeling of fullness in the ear. In more severe cases, you might experience intense pain, swelling of the lymph nodes around the ear, and even fever. It's important to consult a doctor if you notice these symptoms, especially if they worsen or don't improve with over-the-counter treatments.