Derm Cases · Dermatology / Paediatrics
OSCE — napkin rash: irritant vs candida vs dangerous differentials
An 8-minute OSCE station on irritant nappy dermatitis, fold-sparing vs candidal satellite pattern, barrier care and short steroid/antifungal use, and red-flag differentials including LCH and acrodermatitis enteropathica.
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Study tools
Target exams
NEET-PGINICETUSMLEPLABMRCP
Prompt
An 8-minute OSCE station on irritant nappy dermatitis, fold-sparing vs candidal satellite pattern, barrier care and short steroid/antifungal use, and red-flag differentials including LCH and acrodermatitis enteropathica.
Brief (to candidate)
A 6-month-old has a 10-day confluent erythematous napkin rash that spares the inguinal folds. Caregivers use infrequent changes. A second stem shows satellite pustules involving folds. A third stem shows refractory erosive petechial napkin dermatitis. You have 8 minutes to classify, treat, and escalate red flags.
[1]Candidate instructions
- Diagnose classic irritant contact nappy dermatitis.
- Contrast with candidal and seborrhoeic patterns.
- Give first-line barrier and hygiene plan.
- Add short steroid/antifungal when indicated.
- List dangerous differentials if unresponsive.
Examiner checklist (mark each domain / 10)
| Domain | Key actions expected |
|---|---|
| Irritant pattern | Confluent erythema on convexities, spares deep folds; urine/faeces, moisture, friction, enzymes; commonest napkin rash[1][5] |
| Candida pattern | Involves folds, bright red, satellite papules/pustules → add topical antifungal; may coexist after antibiotics/prolonged wetness[1][2] |
| First-line care | Frequent changes, gentle cleansing, air time, thick zinc oxide/barrier paste; avoid harsh wipes/fragrances[4] |
| Anti-inflammatory | Short course mild topical corticosteroid for inflamed irritant disease; antifungal if candidal; treat secondary bacterial infection if present |
| Dangerous DDx | Refractory erosive rash with petechiae → consider Langerhans cell histiocytosis (biopsy); periorificial/acral + diarrhoea/alopecia → acrodermatitis enteropathica (zinc); napkin psoriasis; immunodeficiency; maltreatment context as appropriate[3] |
| Communication | Teach prevention; safety-net failure at ~1 week or systemic features |
Model key actions
- Treat fold-sparing irritant disease with barrier + frequent changes.[4][5]
- Add antifungal when satellite fold disease suggests candida.[2]
- Escalate LCH/zinc deficiency if refractory or petechial/erosive with systemic clues.[3]
Common errors
- Potent steroids under occlusion in the napkin area long-term.
- Missing candidiasis when folds involved.
- Endless "barrier cream" for petechial erosive LCH without biopsy.
- Diagnosing only thrush for every napkin rash.
References5ShowHide
- [1]Chiriac A, Wollina U. Diaper dermatitis-a narrative review of clinical presentation, subtypes, and treatment. Wiener medizinische Wochenschrift (1946), 2024.PMID 37861874
- [2]Helms LE, Burrows HL, et al. Diaper Dermatitis. Pediatrics in review, 2021.PMID 33386307
- [3]Fölster-Holst R. Differential diagnoses of diaper dermatitis. Pediatric dermatology, 2018.PMID 29596730
- [4]Blume-Peytavi U, Kanti V, et al. Prevention and treatment of diaper dermatitis. Pediatric dermatology, 2018.PMID 29596731
- [5]Atherton DJ. Understanding irritant napkin dermatitis. International journal of dermatology, 2016.PMID 27311779