Compare conditions

Put any two — or three — conditions side by side, adult or pediatric, to spot the look-alike differences fast, row by row.

Otitis Externa (Swimmer's Ear)

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In one line

·An infection of the outer ear canal, usually caused by bacteria that grow when water stays trapped in the ear, making the skin inside swollen, painful, and tender to the touch.

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Normal physiology

·The outer ear canal is a tube about one inch long that runs from the opening of the ear to the eardrum. Its skin is thin and delicate, and it's lined with tiny glands that make earwax (cerumen). This wax forms a protective coat—it traps dirt and bugs, and it's slightly acidic (around pH 5), which stops bacteria and fungi from growing. The canal also has a natural way of cleaning itself: dead skin and wax slowly move outward toward the opening, carrying germs and debris away.

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What goes wrong

·When water stays in the ear canal too long—like after swimming or in humid weather—it soaks the skin, washes away the protective wax, and raises the pH from acidic to neutral. The wet, unprotected skin swells, cracks, and loses its barrier. Now bacteria (most often Pseudomonas aeruginosa or Staphylococcus aureus) or sometimes fungi can stick to the damaged skin, multiply, and cause an infection. Anything that scratches or irritates the canal (like cotton swabs, hearing aids, or earbuds) makes it even easier for germs to get in.

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Hallmark signs

·Ear pain that gets worse when you tug on the outer ear or press the little bump in front of the ear canal
·Itching deep inside the ear
·Clear or yellowish fluid draining from the ear
·Ear canal looks red and swollen when the doctor looks inside
·Feeling of fullness or blockage in the ear, sometimes with muffled hearing
·Tender or swollen lymph nodes in front of the ear or down the neck on the same side
·Fever
·Severe pain that does not get better with over-the-counter pain medicine

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Red flags · escalate now

·Fever above 100.4°F (38°C)
·Swelling or redness spreading to the face, jaw, or neck
·Severe pain that does not improve with ibuprofen or acetaminophen
·New hearing loss or dizziness
·Diabetes or a weakened immune system (higher risk for dangerous spread of infection)

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Workup

·Visual inspection of the ear canal with an otoscope (a lighted tool to look inside the ear)
·Culture of ear drainage (swabbing the fluid and growing the germs in a lab)
·Blood glucose (sugar) level, especially in adults with severe or recurring ear infections
·CT scan of the skull base (detailed X-ray pictures of the bone around the ear)
·Inflammatory markers: ESR (erythrocyte sedimentation rate) and CRP (C-reactive protein) blood tests

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Treatment

·Antibiotic ear drops (usually a fluoroquinolone like ciprofloxacin, or a combination of neomycin, polymyxin, and hydrocortisone)
·Pain relief with acetaminophen (Tylenol) or ibuprofen (Advil, Motrin)
·Keep the ear dry: avoid swimming, use earplugs or a shower cap when bathing, and do not insert anything into the ear canal
·Ear wick (a small foam or gauze strip inserted into the swollen ear canal)
·Oral antibiotics (pills, usually a fluoroquinolone like ciprofloxacin), used when infection spreads outside the canal or the patient has diabetes or weak immunity
·IV antibiotics (medicine through a vein) for severe cases like malignant otitis externa, usually an antipseudomonal drug (e.g., piperacillin-tazobactam, cefepime, or ciprofloxacin) for 4 to 6 weeks
·Surgical debridement (cutting away dead, infected tissue and bone)

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NCLEX trap

·When the ear canal is too swollen or plugged to let drops reach the infected skin, your first job is to gently clean out the debris (called débridement) or place a tiny sponge wick that soaks up the medicine and slowly releases it against the canal wall. Drops alone won't work if they can't touch the sore tissue—like trying to water a plant through a closed lid.
·Swimmer's ear is an infection of the skin lining the ear canal, not the middle ear behind the eardrum. Ear drops deliver medicine directly to that skin—much stronger and faster than pills that have to travel through your whole body. Save oral antibiotics for when the infection has spread beyond the canal into surrounding tissue (cellulitis) or the person can't use drops (for example, a damaged eardrum or recent ear surgery).
·In swimmer's ear, the drainage and pain come from the inflamed ear canal itself, not a hole in the eardrum. The eardrum usually looks normal when you peek past the swollen canal. A true rupture (perforation) happens with middle-ear infections and shows a visible tear plus hearing loss. Mistaking canal drainage for eardrum rupture can lead you to avoid safe, effective ear drops when they are exactly what the patient needs.
·Once the infection clears, most people can return to swimming and showering normally. The key is prevention: after water exposure, tip the head to drain each ear and dry the outer canal gently with a towel corner or use a hair dryer on cool, low setting held at arm's length. For people with frequent infections, a few drops of a 1:1 mix of white vinegar and rubbing alcohol after swimming restores the canal's natural acidic barrier and dries out trapped water—like applying a protective coating. Lifetime water avoidance isn't realistic or necessary.
·Aminoglycosides can damage the delicate hearing and balance nerves if they seep through a hole in the eardrum into the middle ear. If you can't see the eardrum clearly because of swelling, or if there's any chance of perforation (recent trauma, chronic ear disease, sudden hearing loss), pick a fluoroquinolone drop (such as ciprofloxacin or ofloxacin) instead—these are safe even if they reach the middle ear. Always look before you drop, and when in doubt, choose the safer option.

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