Derm Cases · Dermatology / General Medicine / Infectious Disease interface
OSCE — assessment of facial and scalp seborrhoeic dermatitis with red-flag severity
An 8-minute OSCE station on recognition of seborrhoeic dermatitis in sebum-rich sites, Malassezia-linked pathophysiology, differential diagnosis (psoriasis, rosacea, tinea), HIV red-flag phenotypes, and evidence-based antifungal plus low-potency anti-inflammatory therapy.
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Target exams
NEET-PGINICETUSMLEPLABMRCP
Prompt
An 8-minute OSCE station on recognition of seborrhoeic dermatitis in sebum-rich sites, Malassezia-linked pathophysiology, differential diagnosis (psoriasis, rosacea, tinea), HIV red-flag phenotypes, and evidence-based antifungal plus low-potency anti-inflammatory therapy.
Brief (to candidate)
A 34-year-old man has greasy yellowish scale and erythema of the scalp, eyebrows, nasolabial folds and retroauricular skin for 6 months, with dandruff and mild itch. Lesions worsen in winter and with stress. He is otherwise well. You have 8 minutes to diagnose, exclude dangerous differentials and systemic associations, and plan topical therapy with maintenance.
[12]Candidate instructions
- Recognise distribution in sebum-rich sites and describe morphology.
- Outline the Malassezia–immune pathophysiology in plain language.
- Differentiate from psoriasis, atopic dermatitis, rosacea, tinea faciei.
- State red flags (extensive/recalcitrant disease → HIV; Parkinsonism association).
- Prescribe stepwise antifungal + anti-inflammatory care and maintenance.
Examiner checklist (mark each domain / 10)
| Domain | Key actions expected |
|---|---|
| Recognition | Erythematous patches with greasy yellowish scale on scalp, face (nasolabial, eyebrows, glabella), ears, central chest — sebum-rich sites; infantile cradle-cap phenotype if asked[1] |
| Pathophysiology | Malassezia yeast + host immune response to yeast lipids/metabolites + barrier dysfunction — not a primary infection requiring systemic antifungals in routine cases[4] |
| Differential | Psoriasis (silvery scale, extensors, nail pitting, Auspitz); rosacea (flushing/papules without greasy seborrhoeic scale pattern); tinea (annular active border — scrape if unsure); AD more flexural/itchy history |
| Red flags / associations | Sudden severe, extensive or treatment-resistant seborrhoeic dermatitis → consider HIV; association with Parkinson disease and other neurological disease; erythroderma pathway if generalised[8] |
| Topical Rx | Scalp: ketoconazole 2% shampoo (or other antifungal shampoo) 2–3×/week then maintenance; face: topical antifungal cream (e.g. ketoconazole) ± short course low-potency topical corticosteroid or calcineurin inhibitor for facial flares[10] |
| Maintenance & education | Relapsing course expected; intermittent antifungal shampoo; avoid harsh soaps; emollient; do not use prolonged potent facial steroids |
| When to escalate | Failure of optimised topicals → review diagnosis, adherence, HIV risk; limited role for systemic antifungals/isotretinoin only in specialist refractory care |
Model key actions
- Diagnose adult seborrhoeic dermatitis by greasy scale in sebum-rich sites.[1]
- Explain Malassezia-driven inflammation and prescribe ketoconazole shampoo/cream with short low-potency steroid or TCI for face.[4][10]
- Screen for HIV if extensive/recalcitrant; set expectation of chronic maintenance.[8]
Common errors
- Treating as pure dandruff/hygiene problem without antifungal strategy.
- Long-term potent facial corticosteroids without antifungal backbone.
- Missing HIV red-flag phenotype in severe/diffuse disease.
- Confusing with psoriasis and escalating unnecessarily to systemic psoriasis therapy without re-examining morphology.
- Omitting maintenance plan (relapse almost certain).
References6ShowHide
- [1]Gupta AK, Bluhm R. Seborrheic dermatitis. Journal of the European Academy of Dermatology and Venereology, 2004.PMID 14678527
- [4]Adalsteinsson JA, Kaushik S, Muzumdar S, et al. An update on the microbiology, immunology and genetics of seborrheic dermatitis. Experimental Dermatology, 2020.PMID 32125725
- [8]Forrestel AK, Kovarik CL, Mosam A, et al. Diffuse HIV-associated seborrheic dermatitis - a case series. International journal of STD & AIDS, 2016.PMID 27013615
- [10]Gupta AK, Versteeg SG. Topical Treatment of Facial Seborrheic Dermatitis: A Systematic Review. American journal of clinical dermatology, 2017.PMID 27804089
- [11]Piacentini F, Camera E, Di Nardo A, et al. Seborrheic Dermatitis: Exploring the Complex Interplay with Malassezia Int J Mol Sci, 2025.PMID 40141293
- [12]Green CA, Farr PM, Shuster S Treatment of seborrhoeic dermatitis with ketoconazole: II. Response of seborrhoeic dermatitis of the face, scalp and trunk to topical ketoconazole Br J Dermatol, 1987.PMID 2950915