Otitis externa is an infection or inflammation of the ear canal, the tube that runs from your outer ear to your eardrum. Most people know it as swimmer’s ear, though you don’t need to swim to get it. It causes pain that worsens when you tug on your ear, and it typically clears up within a week or two with topical treatment.
What Happens in the Ear Canal
Your ear canal is lined with thin skin that sits directly over bone for much of its length. That thin layer of tissue is one reason otitis externa hurts so much: there’s very little cushioning between the inflamed skin and the sensitive bone underneath. The canal also sits in a warm, dark environment that traps moisture, making it a hospitable place for bacteria and fungi to grow once the skin’s natural defenses break down.
In a healthy ear, a thin coating of earwax protects the canal by keeping it slightly acidic and water-resistant. When that protective layer gets disrupted, whether from water exposure, aggressive cleaning, or skin irritation, bacteria can colonize the raw skin and trigger infection. The inflammation sometimes extends beyond the canal to the visible outer ear, including the small flap of cartilage (the tragus) that sits in front of the canal opening.
Common Causes and Triggers
Water is the most frequent culprit. Moisture that lingers in the ear canal after swimming, showering, or bathing softens the skin and washes away protective wax, creating ideal conditions for bacterial growth. Cotton swabs are the other major offender. Inserting anything into the canal can scratch the lining and push wax deeper, removing the barrier that keeps bacteria out.
Other triggers include earbuds or hearing aids that trap moisture and create friction, hair products that drip into the canal and irritate the skin, and skin conditions like eczema or psoriasis that compromise the canal lining. People who live in hot, humid climates get otitis externa more often, as do those who spend a lot of time in pools or lakes.
What It Feels Like
The hallmark symptom is ear pain that gets worse when you pull on the outer ear or press on the tragus. This distinguishes it from a middle ear infection, which causes pain deeper inside the head and doesn’t hurt with external pressure. A middle ear infection also involves fluid behind the eardrum, while otitis externa affects only the canal itself.
Early on, you might notice itching in the canal and mild redness. As the infection progresses, the pain intensifies and the canal begins to swell. Many people notice a feeling of fullness or blockage, sometimes with hearing that sounds muffled on the affected side. Discharge from the ear, which can be clear, white, or yellowish, is common. In more severe cases, the swelling can nearly close off the canal, and the pain may radiate to the jaw or side of the face.
How It’s Treated
Topical ear drops are the standard treatment. Most prescriptions combine an antibiotic to fight infection with a steroid to reduce swelling and pain. These drops work directly at the site of infection, which is why oral antibiotics are rarely needed for a straightforward case. If the canal is too swollen for drops to penetrate, your provider may place a small sponge wick into the canal that draws the medication inward. The wick usually falls out on its own as swelling goes down.
When applying ear drops, lie on your side with the affected ear facing up. Gently pull the outer ear up and back to straighten the canal, then let the drops fall in. Stay in that position for five minutes so the medication reaches the full length of the canal. Sitting up immediately lets the drops drain right back out, which is one of the most common reasons treatment seems slow to work.
Most people start feeling better within 48 to 72 hours, though it’s important to finish the full course of drops even after the pain improves. During treatment, keep the ear as dry as possible. Use a cotton ball lightly coated in petroleum jelly to block water during showers, and avoid swimming until the infection has fully cleared.
How It Differs From a Middle Ear Infection
The two conditions affect different parts of the ear, and telling them apart is usually straightforward. With otitis externa, pain increases when you tug on the outer ear or push on the tragus. With a middle ear infection (otitis media), those movements don’t change the pain at all. Middle ear infections also tend to follow colds or upper respiratory infections and are far more common in young children, while otitis externa can happen at any age.
A provider can confirm the diagnosis by looking into the canal with an otoscope. In otitis externa, the canal appears red and swollen, and the eardrum itself is usually normal. In a middle ear infection, the eardrum looks bulging or cloudy from fluid trapped behind it.
When It Becomes Serious
In rare cases, the infection spreads from the ear canal into the surrounding bone. This is called necrotizing (or malignant) otitis externa, and it’s most often seen in older adults with diabetes or anyone with a weakened immune system. The warning signs are pain that seems out of proportion to how the ear looks, pain that worsens at night, and discharge that doesn’t improve after a week or more of standard ear drops.
Granulation tissue, small grainy bumps of inflamed tissue visible deep in the canal, is a telltale sign of this complication. If the infection spreads further, it can affect nearby nerves, sometimes causing facial weakness or drooping on the affected side. Necrotizing otitis externa requires aggressive treatment with extended courses of antibiotics and close monitoring, so recognizing the warning signs early matters.
Preventing Swimmer’s Ear
The simplest prevention strategy is keeping your ears dry. After swimming or showering, tilt your head to each side and gently pull the earlobe in different directions to help water drain out. A hair dryer on the lowest heat setting, held about a foot from the ear, can evaporate lingering moisture.
A homemade preventive rinse of equal parts white vinegar and rubbing alcohol can help after water exposure. The alcohol promotes drying while the vinegar restores the canal’s natural acidity, making it harder for bacteria and fungi to take hold. Pour a small amount into the ear, let it sit briefly, then tilt your head to drain it. Don’t use this mixture if you have an active infection, ear tubes, or a perforated eardrum.
Resist the urge to clean your ear canals with cotton swabs, bobby pins, or anything else you can fit inside them. Earwax migrates outward on its own. Removing it strips away one of the canal’s best defenses and risks scratching the skin. If you wear hearing aids or earbuds frequently, clean them regularly and give your ears periodic breaks to air out.