Diagnosing otitis externa, or an outer ear infection, is a structured process that relies on both your clinical history and a physical examination of the ear canal. In 2026, GPs in the UK follow specific diagnostic pathways to differentiate between bacterial infections, fungal growth, and inflammatory skin conditions. A thorough exam allows the clinician to determine the severity of the infection and select the most effective topical treatment.
What We Will Cover in This Article
- The role of clinical history in identifying infection triggers
- The physical signs a GP looks for during a visual inspection
- How otoscopy allows for the visualisation of the ear canal and eardrum
- The significance of the tragus tenderness test in diagnosis
- When a GP might take an ear swab for laboratory analysis
- Differentiating between otitis externa and middle ear infections
Clinical History and Symptom Review
- Recent Exposure: They will ask about recent swimming, use of cotton buds, or changes in hearing aid use.
- Symptom Progression: The GP looks for a history of intense itching followed by pain, which is classic for otitis externa.
- Pain Characteristics: Pain that worsens when you move your jaw or touch your ear is a strong indicator of an outer canal issue.
Visual Inspection and Physical Tests
The GP starts by looking at the outer part of the ear, known as the pinna, and the surrounding skin.
- The Tragus Sign: Your GP will gently press on the small flap of cartilage in front of your ear canal, called the tragus, or pull on the earlobe. If this causes significant pain, it is a hallmark sign of otitis externa.
- External Redness: They look for swelling or redness at the entrance of the canal.
- Lymph Node Check: The GP may feel the area around your ear and neck to see if your lymph nodes are swollen, which indicates the body is fighting an active infection.
Otoscopy: Seeing Inside the Canal
The primary tool for diagnosis is the otoscope. This is a handheld device with a light and a magnifying lens.
What the GP sees:
- Canal Narrowing: In severe cases, the skin of the canal is so swollen that the opening appears as a tiny slit.
- Debris and Discharge: The GP identifies the type of discharge. Thick, white, or cheesy discharge often suggests a fungal infection, while yellow or green discharge usually points to bacteria.
- Eardrum Integrity: A vital part of the exam is checking the eardrum. If the eardrum is healthy and intact, the infection is confirmed as localised to the outer canal. If the eardrum is bulging or red, the diagnosis may shift to otitis media.
When Clinical Swabbing is Necessary
Most outer ear infections are treated empirically with broad spectrum drops. However, in 2026, a GP will take an ear swab if:
- The infection is recurrent and does not respond to initial treatment.
- There are visible signs of fungal spores like black or white dots.
- The infection is particularly severe or involves the surrounding skin.
The swab is sent to a lab to identify the specific pathogen and determine which antibiotics or antifungals will be most effective.
Differentiating the Diagnosis
A key goal of the ear exam is to rule out other conditions that mimic otitis externa.
| Feature | Otitis Externa | Otitis Media |
| Primary Pain Site | Outer canal and tragus | Deep inside the ear |
| Pain on Movement | Severe pain when pulling ear | No pain when pulling ear |
| Otoscopy Finding | Swollen, debris filled canal | Red, bulging eardrum |
| Hearing Loss | Conductive due to blockage | Conductive due to fluid |
To Summarise
GPs diagnose otitis externa by combining your history of ear pain and itching with a physical exam that focuses on tragus tenderness and otoscopic visualisation of the canal. In 2026, the clinical focus is on identifying whether the infection is bacterial or fungal and ensuring the eardrum is not involved. This precise diagnosis ensures that you receive the correct medicated drops to clear the infection quickly and prevent it from returning.
If your ear is too painful to touch or you have noticed discharge, the next clinical step is to have a GP or trained pharmacist perform otoscopy to confirm the state of your ear canal.
Does an ear exam hurt if I have an infection?
It can be uncomfortable because the skin is inflamed. However, GPs are trained to be very gentle and will use a smaller speculum if the canal is significantly swollen.
Can a GP diagnose a fungal infection just by looking?
Often, yes. Fungal infections, or otomycosis, have a very distinct appearance under the otoscope, often looking like wet newspaper or having small black or white fuzzy spots.
What if the GP cannot see my eardrum because of wax?
If wax or debris is blocking the view, the GP may need to gently clean the ear or prescribe drops to clear the blockage before a full diagnosis can be made.
Is it possible to have both an outer and middle ear infection?
Yes. Sometimes an infection from the middle ear can leak through a perforated eardrum and cause secondary inflammation in the outer canal.
How long does a typical ear exam take?
The physical examination usually takes less than five minutes per ear. The majority of the appointment time is spent discussing your symptoms and treatment plan.
Will the GP check both ears even if only one hurts?
Yes. GPs always check the healthy ear first to establish a baseline for what your normal anatomy looks like and to ensure the infection has not started to spread.
Authority Snapshot
This article was reviewed by Dr. Stefan Petrov, a UK trained physician with an MBBS and extensive experience in general medicine, surgery, anaesthesia, ophthalmology, and emergency care. Dr. Petrov has worked in both hospital wards and intensive care units, performing diagnostic and therapeutic procedures, and has contributed to medical education by creating patient focused health content and teaching clinical skills to junior doctors.
