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Otitis externa

life science Maturity 11-13 Next article →

Otitis externa is a medical condition defined by inflammation of the ear canal. It is frequently called "swimmer's ear" because of its connection to water exposure. This inflammation causes the skin inside the canal to become red and swollen.

Eczema ear2
Eczema ear2

Patients often experience significant ear pain, itching, and a sense of fullness. In some instances, swelling or discharge can block the canal entirely. This blockage may lead to temporary conductive hearing loss, where sounds seem muffled.

The development of otitis externa requires two specific factors to occur simultaneously. First, there must be the presence of pathogens, such as bacteria or fungi, that can infect the skin. Second, there must be an impairment in the integrity of the ear canal skin. The skin in this area is unique because it is paper-thin and attached directly to the bone. Because it is not movable, it is easily abraded by physical force.

OtitisExterna10
OtitisExterna10

Common causes of these skin breaks include using cotton swabs, fingernails, or other small implements for self-cleaning. Prolonged water exposure can also saturate the skin, compromising its natural barrier function.

Medical professionals classify the condition into two distinct types based on duration and cause. Acute otitis externa (AOE) occurs suddenly and typically lasts less than six weeks. These cases are predominantly caused by bacterial infections, such as Pseudomonas aeruginosa or Staphylococcus aureus. Chronic otitis externa is defined by symptoms lasting more than three months. Chronic cases are often linked to allergies or autoimmune disorders rather than sudden bacterial attacks. Fungal infections, known as otomycosis, can also occur and may range from inconsequential to extremely severe.

Diagnosing the condition involves looking for specific clinical signs and symptoms. A primary indicator is tenderness when the outer ear, or pinna, is moved or touched. Doctors also check for pain when pressing the tragus, which is the small, tablike part of the ear in front of the canal.

Eczema ear2
Eczema ear2

During a physical exam, an otoscope may show a red, swollen canal or scaly skin similar to eczema. In severe cases, the canal may appear so narrow from swelling that the eardrum is difficult to see. Some patients may also experience swelling in the lymph nodes located directly beneath the ear.

Statistically, otitis externa is a common issue that affects 1% to 3% of the population every year. More than 95% of these reported cases are the acute variety. Approximately 10% of people will experience an episode at some point in their lives. The condition occurs with near equal frequency in males and females. It is most common among children aged seven to twelve and among the elderly. People living in warm and wet climates are also at a higher risk.

Treatment strategies depend heavily on whether the infection is bacterial or fungal. For acute bacterial cases, doctors typically prescribe antibiotic ear drops like ofloxacin. Steroid drops are often added to help reduce inflammation and edema. If the infection is fungal, over-the-counter anti-fungal solutions are often effective. It is important to note that using antibacterial drops containing steroids can actually make a fungal infection worse. For pain management, medications such as ibuprofen are commonly used.

Prevention focuses on maintaining the health of the ear canal skin. The most important rule is to avoid inserting objects like cotton swabs into the ear. Most healthy ear canals have a natural self-cleaning and self-drying mechanism. After swimming, individuals can use a small battery-powered ear dryer to remove moisture. Using earplugs can also help, but they must fit well to avoid scratching the skin. Avoiding polluted water and being careful with in-ear headphones can further reduce the risk of infection.

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