Malignant Otitis Externa: Causes, Symptoms, and Treatment
Medically reviewed by Sumiran Racherla, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Malignant Otitis Externa?
An ear, nose, and throat doctor, also called an otolaryngologist, usually manages malignant otitis externa. An infectious disease doctor, who treats serious infections, can help choose the antibiotics. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is malignant otitis externa?
Malignant otitis externa is a serious infection that starts in the outer ear canal, the tube that leads to the eardrum. It can spread to the bone at the base of the skull. Doctors now often call it necrotizing otitis externa. It is not cancer. The word malignant comes from the high death rate this infection had in the past. It can be life-threatening. It is uncommon, and it is mainly found in older people and people with diabetes.
Symptoms
Common signs of malignant otitis externa include:
- Ear pain that does not let up, especially at night.
- Ear drainage that does not get better with the usual ear drops.
- Headaches along with the ear pain.
- A red, swollen, and painful outer ear.
- Bone that can be seen in the ear canal.
As the infection spreads, it can harm nerves that start in the brain. This can cause facial weakness, trouble swallowing, hoarseness, shoulder weakness, and tongue weakness. Fever is rare.
Causes and who gets it
Most cases are caused by a germ called Pseudomonas aeruginosa, which is found in water. Other bacteria and some fungi can also cause it. It usually starts as a simple outer ear infection, also called swimmer's ear. From there, the infection can spread into the bone near the ear and the base of the skull.
Most people who get it are older adults, mostly men, who have a weak immune system, the body's defense against germs. Diabetes is the most common reason for a weak immune system in these patients. Other risk factors include HIV, cancer, and chemotherapy. It is uncommon in children.
How doctors diagnose it
A doctor looks in the ear and checks for severe pain and swelling. The doctor also tests the nerves of the face and throat, since these nerves are often affected. Fluid or tissue from the ear is sent to a lab to find the germ. A small piece of ear canal tissue, called a biopsy, may be taken to rule out other causes such as cancer.
Other tests can include:
- Blood tests, which usually show signs of inflammation.
- A blood sugar test, and a diabetes check for people not known to have diabetes.
- A CT scan, which uses X-rays to show bone damage.
- An MRI scan, which shows how far the infection has spread, including to nerves.
Treatment
Antibiotics that work against the germ are the recommended treatment. Ear drops alone are usually not enough. The medicine may be given through a vein or by mouth. Treatment with antibiotics goes on for a long time. A fungal infection needs a different kind of medicine.
Tight blood sugar control is part of treatment for people with diabetes. Doctors may also clean the ear canal. Surgery is used when medicine has not worked. It can include removing dead tissue and draining abscesses, which are pockets of pus.
Hyperbaric oxygen, which means breathing oxygen inside a pressure chamber, is sometimes used. Many studies show it adds no benefit to medicine or surgery. After the infection clears, doctors keep checking for a return of the infection for up to a year.
When to see a doctor
See a doctor soon if you have ear pain or drainage that does not improve with the usual ear drops, especially if you have diabetes or a weak immune system. This infection can spread quickly, so early care matters. Call 911 or go to the emergency room if you have facial weakness, trouble swallowing, a hoarse voice, confusion, or a sudden change in mental state with an ear infection. The first signs can mean the infection has harmed nerves or spread toward the brain.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. It can check an ear infection that is not getting better and help manage blood sugar. It can also help coordinate the specialists who care for this infection.
Common questions
Is malignant otitis externa cancer?
No, it is an infection and not a cancer. The name comes from the high death rate it had in the past.
Is malignant otitis externa life threatening?
Yes, it can be life-threatening. Today's tests and treatment have greatly lowered the death rate compared with the past.
Who is most at risk of malignant otitis externa?
Older adults and people with diabetes or a weak immune system are most at risk.
Can malignant otitis externa come back?
Yes, it can come back, even up to a year after treatment. This is why doctors check on patients regularly for up to a year.
Can malignant otitis externa be prevented?
Yes, you can lower your risk, because good blood sugar control can lower the risk and make the infection less severe. Taking steps to avoid swimmer's ear, especially in hot and humid places, may also help.
Sources
- National Library of Medicine (StatPearls) - Necrotizing (Malignant) Otitis Externa
- NHS England - Clinical commissioning policy: Hyperbaric oxygen therapy for malignant otitis externa
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
