Fungal Ear Infection (Otomycosis)

How a fungal ear infection develops

The ear canal is normally protected by acidic, water-repellent earwax. When this protection is lost, fungi that live harmlessly in the environment can grow. Otomycosis causes about 10% of outer ear infections and is more common in tropical climates. It is often a cause of otitis externa (swimmer's ear) that does not respond to antibiotic drops.

Symptoms

• intense itching, often the main symptom
• a feeling of fullness or blockage
• muffled hearing
• ear pain, usually milder than in bacterial infection
• discharge, which may be thick, white, gray, yellow or black
• visible debris that looks like wet tissue paper, cotton wool or black dots (spores)
• ringing in the ear in some cases

Causes and risk factors

• moisture: swimming, showering, sweating and humid weather
• antibiotic or steroid ear drops, which disturb normal bacteria and allow fungi to grow
• cotton swabs and scratching, which remove protective wax and injure the skin
• hearing aids and earbuds that trap moisture
• skin conditions: eczema, psoriasis and seborrheic dermatitis of the ear canal
• diabetes and weakened immunity
• previous ear surgery or a perforated eardrum

Diagnosis

A doctor looks into the ear with an otoscope or microscope. The appearance of fungal debris, such as fluffy white strands or black spores, is often enough. A swab sent for culture can confirm the fungus and rule out bacterial infection. The doctor will check whether the eardrum is intact, because this affects which drops are safe. See eardrum perforation.

Treatment

Professional cleaning

The most important step. An ENT specialist or trained clinician removes the fungal debris by gentle suction under a microscope or by dry mopping. Drops cannot reach the skin if debris remains. Several cleanings may be needed.

Antifungal treatment

• Clotrimazole 1% solution drops are commonly used, usually for 1 to 3 weeks
• Other options: econazole, miconazole, or acidifying drops such as acetic acid
• Oral antifungals are rarely needed, except for resistant cases, invasive infection or weakened immunity
• If the eardrum has a hole, your doctor will choose drops that are safe for the middle ear

Self-care during treatment

• keep the ear dry: use a cotton ball coated in petroleum jelly in the ear when showering
• avoid swimming until it has cleared
• do not use cotton swabs or insert anything into the ear
• remove hearing aids as much as possible during treatment

Complications

Most cases resolve without complications. Uncommon problems include:

• eardrum perforation, particularly with Candida
• spread to the middle ear in people with existing perforation
• malignant (necrotizing) otitis externa, a rare spreading infection of the skull base, mostly in older adults with diabetes

Prevention

• dry ears after swimming or showering by tilting the head and gently drying the outer ear, or use a hairdryer on a low, cool setting at arm's length
• use swimming earplugs if you swim often
• avoid cotton swabs
• use antibiotic ear drops only when prescribed and for the recommended length of time
• clean and dry hearing aids and earbuds regularly
• treat skin conditions of the ears

Frequently asked questions

What are the symptoms of a fungal ear infection?

The main symptoms are intense itching, a blocked or full ear, muffled hearing, mild pain and discharge. Doctors often see fluffy white, gray or black debris in the ear canal. Symptoms often persist despite antibiotic ear drops.

How is a fungal ear infection treated?

A clinician cleans the fungal debris from the ear canal, then antifungal drops such as clotrimazole are used for 1 to 3 weeks. Keeping the ear dry and avoiding cotton swabs is essential. Severe or resistant cases may need repeat cleaning or oral antifungals.

What causes otomycosis?

It is caused by fungi, usually Aspergillus or Candida, that thrive in warm, moist ear canals. Risk factors include swimming, humid climates, prolonged use of antibiotic ear drops, cotton swab use, hearing aids, skin conditions and diabetes.

Is a fungal ear infection serious?

Usually not. Most clear completely with cleaning and antifungal drops. Rarely, it can cause an eardrum perforation, and in people with diabetes or weak immunity, ear infections can spread. Severe pain, facial weakness or fever needs urgent care.

Can I treat a fungal ear infection at home?

Home treatment alone is not recommended, because the debris must be removed for drops to work and a doctor needs to check the eardrum. While waiting, keep the ear dry, avoid cotton swabs and do not put oils or homemade remedies in the ear.