Ear and nose dermatoses

Meet the patient

A 68-year-old man is referred for "a painful spot on his ear that won't settle". He sleeps on that side, and the nodule on the rim of his helix wakes him every night when he turns over. On examination there is a small, crusted, exquisitely tender nodule on the helix — but on the other ear the pinna is red, swollen, and tender, and the lobe is conspicuously spared.[1][5]

Two questions sort every ear and nose lesion, and they are the two this topic hangs on: does it involve the cartilage or the lobe? (cartilage, lobe spared = relapsing polychondritis) and does it heal? (a non-healing crust on a sun-exposed rim = biopsy for keratinocyte cancer). Hold those two questions and the five diagnoses below fall into place.[4][12]

Five diagnoses, one anatomical map

The external ear and nose are thin skin over cartilage on maximal-UV prominences, and that anatomy dictates the entire differential. Examiners test whether you can separate local pressure disease (CNH), systemic cartilaginous disease (RP), canal infection (AOE), rosacea phymatous change, and actinic neoplasia — five diseases, one map.[1][4][9]

[1]

CNH — the pressure nodule that creams will not fix

Chondrodermatitis nodularis helicis is a pressure–ischaemia injury of skin stretched tight over cartilage, and the only disease-modifying treatment is to remove the pressure. A small, exquisitely tender nodule sits on the helix or antihelix, almost always unilateral on the preferred sleep side; the patient wakes when the ear is pressed, and a central crust or ulcer is common.[1][3]

The mechanism is mechanical, not inflammatory — chronic microtrauma from sleep, phones, headgear, or hearing aids between tightly applied skin and unyielding cartilage produces a focal ischaemic nodule. That is why endless topical steroids without pressure offloading is the single commonest management failure.[2][3]

The classic trap: a tiny crusted helix papule that wakes the patient every night is CNH until proven otherwise — say it, change the pillow, then discuss adjuncts. Do not jump to cancer without also solving the pressure, and do not ignore cancer if the lesion is atypical, progressive, or non-healing after offloading.[1][2]

Relapsing polychondritis — the lobe that is spared

A red, swollen, painful pinna that spares the earlobe is relapsing polychondritis, not cellulitis — and the lobe is spared for one reason only: it has no cartilage. This is the viva kill-shot, because it converts a dermatological sign into a systemic disease in a single observation.[4][5]

RP is an immune-mediated inflammation of cartilaginous structures — the auricular cartilage, the nasal septum, the respiratory tract, the eyes, and the joints. Attacks are recurrent; nasal chondritis can progress to a saddle-nose deformity, and airway involvement is the life-threatening complication that demands emergency escalation.[4][6]

The danger is airway and aortic. Laryngotracheobronchial chondritis can produce stridor and airway collapse; aortic root dilatation and valvular regurgitation are recognised cardiac complications. A multisystem review — joints, eyes, airway, nose — is mandatory at first contact, not optional.[4][6]

Acute otitis externa — the canal, not the pinna

Acute otitis externa reads as canal pain, discharge, and tragal tenderness with pain on pinna traction — and it is a topical-first disease with a short list of systemic exceptions. The AAO-HNS guideline puts aural toilet, appropriate topical therapy, pain control, and water precautions at the centre of care.[9][10]

The red flag is malignant (necrotising) otitis externa. Severe otitis externa in a diabetic, elderly, or immunocompromised host — with deep otalgia, granulation at the osseocartilaginous junction, and a failure to respond to topical therapy — is Pseudomonas osteomyelitis of the skull base until proven otherwise, and it needs urgent ENT, systemic antipseudomonal antibiotics, and imaging, not another week of drops.[9][10]

Rhinophyma — phymatous rosacea, not alcohol

A bulbous, irregular nose with prominent pores and thickened skin is rhinophyma — the phymatous end of the rosacea spectrum — and it is not a marker of alcohol use disorder, however often the folklore is repeated. Sebaceous and soft-tissue hyperplasia under chronic rosaceous inflammation produces the cosmetic bulk; stigmatising the patient is both wrong and clinically lazy.[7][8]

Treatment sequences medical control of the active inflammatory rosacea first, then procedural recontouring — electrosurgery, laser, or surgical sculpting — for established phymatous bulk, always after counselling about scar and recurrence.[7][8]

Actinic neoplasia — the non-healing crust is a biopsy

The helix rim and the nasal tip are the two highest-stakes UV sites on the face, and any scaly plaque, pearly papule, or non-healing ulceration there is a keratinocyte cancer until histology says otherwise. Actinic keratoses are scaly plaques; basal cell carcinoma is a pearly, translucent papule with arborising vessels; cutaneous SCC is an indurated or ulcerated nodule on a background of field cancerisation.[12]

The S3 guideline for actinic keratosis and cutaneous SCC places biopsy-guided management along the AK-to-SCC pathway at the centre, with ear and nose lesions frequently requiring specialist reconstructive planning because of the cosmetic and functional stakes.[12]

What juniors write vs what gets marks: writing "cellulitis" or "infected sebaceous cyst" for a non-healing crust on a sun-damaged helix loses the stem. The answer that earns marks is biopsy — because destruction or endless antibiotics forfeits the histology that would have caught an early SCC.[12]

The face-off — one discriminator each

At the bedside, the five diagnoses part cleanly on a single feature each. Memorise the discriminator, not the list — the discriminator is what you will say under examination pressure.[1][4]

[1] [9]

The bedside round — three jobs, five sites

Examination in ear and nose disease has three jobs: find the lesion, screen for systemic chondritis, and decide whether to biopsy. Begin with the sleep side, headgear, hearing aids, UV occupation, and prior skin cancers in the history.[1]

Then run the systemic screen for relapsing polychondritis — joints, eyes, airway, and a nasal saddle change — because a red ear is never just an ear in that disease. Pull the tragus and pinna, perform otoscopy when canal disease is suspected, and run a full head-and-neck UV field examination.[4][9]

Document size and photograph nodules for response after offloading — serial photography is the objective measure that tells you whether the pressure advice worked, and it is the cheapest surveillance tool available.[1]

Investigations — clinical first, biopsy the doubt

Most CNH and rosacea are clinical diagnoses, and the only investigation that changes management in this topic is the biopsy of a suspicious or non-healing lesion. Biopsy atypical, progressive, or non-healing lesions, and any lesion where keratinocyte cancer cannot be excluded — particularly in immunosuppressed patients, where the threshold drops sharply.[12]

Relapsing polychondritis is a clinical multisystem diagnosis supported by the inflammatory context — do not wait for a mythical single pathognomonic blood test before recognising the pattern. Culture selected refractory AOE cases, especially in immunocompromised hosts where malignant OE is a live concern.[4][6][10]

Management — match the disease, not the habit

Each of the five diagnoses has a different first move, and matching the disease to the treatment is the whole management game. A pressure nodule treated with steroids fails; a chondritis treated as cellulitis misses a systemic disease; a non-healing crust treated with antibiotics forfeits the histology.[1]

[1]

CNH — pressure relief is disease-modifying: change the sleep side, use a protective doughnut pillow or padding, and avoid local trauma. Adjuncts include topical or intralesional corticosteroids; refractory nodules may need procedural options (excision, cartilage-sparing techniques) chosen by experience and morphology.[1][2][3]

Acute otitis externa — aural toilet, appropriate topical therapy, pain control, and water precautions per AAO-HNS principles; add systemic therapy when extension or host risk demands it.[9][10]

Relapsing polychondritis — rheumatology-led systemic anti-inflammatory and immunosuppressive therapy once infection mimics are addressed; dermatology's role is to recognise the ear and protect the cartilage long-term.[4][6]

Rhinophyma and rosacea — treat active inflammatory rosacea medically; established phymatous bulk needs electrosurgery, laser, or surgical recontouring after counselling on scar and recurrence.[7][8]

Keratinocyte neoplasia — biopsy-guided management along the AK, SCC, and BCC pathways; ear and nose lesions often need specialist reconstructive planning because of the cosmetic and functional stakes.[12]

The preventable-harm list and the nasal analogues

Three harms are preventable in this topic if the diagnosis is named early, and all three come from treating the wrong disease.[4]

• Labelling relapsing polychondritis as recurrent cellulitis — the patient is given repeated antibiotic courses while airway and aortic disease advance unchecked. The lobe-sparing sign is the rescue.[5][6]
• Endless CNH creams without pressure offloading — the nodule never resolves and the patient loses faith in the clinic; the disease-modifying move is the pillow, not the steroid.[2]
• Missing a helix or nasal-tip SCC — a non-healing crust treated as infection forfeits the histology; biopsy the doubt, especially in immunosuppressed and outdoor-labour patients.[12]

The nasal analogues follow the same pressure and actinic logic. Chondrodermatitis nodularis nasi is the pressure analogue of CNH on the nose, and hearing-aid dermatitis mixes pressure, moisture, and contact allergy — remove the stimulus, then treat the inflammation.[11][1]

[1] [4]

Prognosis, guidelines, and regional notes

CNH often improves when pressure is truly removed; residual nodules may need procedures. Relapsing polychondritis is relapsing–remitting and needs long-term specialty follow-up for airway, aortic, and joint disease. Rhinophyma bulk does not fully reverse with cream alone once established.[2][4][8]

AAO-HNS AOE guidance underpins topical-first canal care with clear systemic exceptions — malignant OE in the high-risk host, and extension beyond the canal.[9][10] CNH literature is therapy-review and case-series heavy, and pressure modification remains the conceptual core.[2][3] Rosacea reviews sequence medical control before procedural rhinophyma work.[7]

The mantra, and the mnemonic

[1] [4]

The mantra: lobe spared is the polychondritis sign; pressure off is the CNH cure; biopsy the doubt on a sun-damaged rim.[1][4][12]

[1]

Ward-round test

Stem 1 — A 70-year-old man has a tender, crusted nodule on the rim of his right helix that wakes him every night when he sleeps on that side. He has tried three courses of antibiotic cream without change. What is the diagnosis, and what is the disease-modifying treatment?[1]

Answer

This is chondrodermatitis nodularis helicis — a pressure–ischaemia nodule of skin stretched tight over cartilage. The disease-modifying treatment is pressure offloading: change the sleep side, use a protective doughnut pillow or padding, and avoid local trauma from phones or headgear. Topical or intralesional corticosteroids are adjuncts; the endless antibiotic cream is the commonest failure, and a non-healing or atypical lesion after offloading must be biopsied.[1][2]

Stem 2 — A 55-year-old woman has a red, swollen, painful pinna of three days. She has also had a sore, red left eye and arthralgia. The earlobe is conspicuously uninvolved. What is the diagnosis, what must you screen for, and what is the danger?[4]

Answer

This is relapsing polychondritis — the lobe is spared because it lacks cartilage, and the ocular inflammation and arthralgia confirm multisystem disease. Screen the airway (laryngotracheobronchial chondritis), the cardiovascular system (aortic root dilatation and valvular regurgitation), and the nasal cartilage (saddle-nose risk). The danger is airway compromise and aortic disease — escalate to rheumatology and consider emergency assessment if there is stridor.[4][6]

Stem 3 — A 74-year-old diabetic man has severe otalgia and a discharging canal that has not responded to a week of topical drops. Otoscopy shows granulation tissue at the osseocartilaginous junction. What is the feared diagnosis, and what do you do?[9]

Answer

This is malignant (necrotising) otitis externa — Pseudomonas osteomyelitis of the skull base in a high-risk host, signalled by deep otalgia, granulation at the osseocartilaginous junction, and failure of topical therapy. Arrange urgent ENT referral, systemic antipseudomonal antibiotics, and imaging (CT temporal bone and nuclear medicine), and do not continue topical drops alone.[9][10]

Stem 4 — A 62-year-old outdoor labourer has a non-healing, indurated crust on the rim of his left helix for four months. What is the single most important next step, and why?[12]

Answer

Biopsy the lesion. The helix rim is a maximal-UV, high-stakes site, and a non-healing indurated crust is a keratinocyte cancer — cutaneous SCC or BCC — until histology says otherwise. Destruction or another antibiotic course forfeits the histology; biopsy-guided management along the AK-to-SCC pathway is the standard, with specialist reconstructive planning given the cosmetic and functional stakes.[12]

References

1. [1]Zhang LW, Wu J, Chen T. Chondrodermatitis nodularis helicis Cleve Clin J Med, 2023.PMID 37263665
2. [2]Shah S, Fiala KH. Chondrodermatitis nodularis helicis: A review of current therapies Dermatol Ther, 2017.PMID 27723195
3. [3]Salah H, Urso B, Khachemoune A. Review of the Etiopathogenesis and Management Options of Chondrodermatitis Nodularis Chronica Helicis Cureus, 2018.PMID 29805936
4. [4]Mertz P, Sparks J, Kobrin D, et al. Relapsing polychondritis: Best Practice & Clinical Rheumatology Best Pract Res Clin Rheumatol, 2023.PMID 37839908
5. [5]Karp NC, Goglin SE. Ear Swelling of Relapsing Polychondritis J Gen Intern Med, 2023.PMID 36854868
6. [6]Rapini RP, Warner NB. Relapsing polychondritis Clin Dermatol, 2006.PMID 17113965
7. [7]Sharma A, Kroumpouzos G, Kassir M, et al. Rosacea management: A comprehensive review J Cosmet Dermatol, 2022.PMID 35104917
8. [8]Tüzün Y, Wolf R, Kutlubay Z, et al. Rosacea and rhinophyma Clin Dermatol, 2014.PMID 24314376
9. [9]Rosenfeld RM, Schwartz SR, Cannon CR, et al. Clinical practice guideline: acute otitis externa executive summary Otolaryngol Head Neck Surg, 2014.PMID 24492208
10. [10]Rosenfeld RM, Brown L, Cannon CR, et al. Clinical practice guideline: acute otitis externa Otolaryngol Head Neck Surg, 2006.PMID 16638473
11. [11]Kasitinon SY, Vandergriff T. Chondrodermatitis nodularis nasi J Cutan Pathol, 2020.PMID 32578245
12. [12]Leiter U, Heppt MV, Steeb T, et al. S3 guideline actinic keratosis and cutaneous squamous cell carcinoma - update 2023, part 2: epidemiology and etiology, diagnostics, surgical and systemic treatment of cutaneous squamous cell carcinoma (cSCC), surveillance and prevention J Dtsch Dermatol Ges, 2023.PMID 37840404