Derm Cases · Dermatology
OSCE — intensely itchy axillary papules: Fox–Fordyce apocrine miliaria
An 8-minute OSCE on Fox–Fordyce disease (apocrine miliaria) morphology, apocrine-site distribution, distinction from HS, and first-line topical clindamycin/retinoid plus hormonal options.
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Target exams
NEET-PGINICETUSMLEPLABMRCP
Prompt
An 8-minute OSCE on Fox–Fordyce disease (apocrine miliaria) morphology, apocrine-site distribution, distinction from HS, and first-line topical clindamycin/retinoid plus hormonal options.
Brief (to candidate)
A 22-year-old woman has intensely pruritic 1–3 mm flesh-coloured papules in both axillae with local anhidrosis and hair loss in follicles; symptoms worsen premenstrually. You have 8 minutes to diagnose Fox–Fordyce disease, exclude hidradenitis, and outline stepwise therapy.
[1]Candidate instructions
- Define Fox–Fordyce / apocrine miliaria pathogenesis (apocrine duct obstruction).
- Describe distribution and morphology.
- Differentiate from hidradenitis suppurativa, miliaria crystallina/rubra, and folliculitis.
- Prescribe first-line topical clindamycin + retinoid and hormonal options.
- List second-line physical modalities for refractory disease.
Examiner checklist (mark each domain / 10)
| Domain | Key actions expected |
|---|---|
| Definition | Chronic pruritic papular disease of apocrine-bearing skin from keratinous obstruction of apocrine duct into follicle → retention, rupture, perifollicular inflammation (apocrine miliaria)[1][2] |
| Clinical | Women 15–35; axillae, anogenital, areolae, periumbilical/sternal; dome-shaped 1–3 mm skin-coloured papules; intense itch; local anhidrosis and reduced hair; premenstrual flares common[1][3] |
| Dermoscopy / histology support | Dermoscopy may show follicular-centred papules; histology apocrine duct spongiosis/plug/foam cells when biopsied; clinical diagnosis often sufficient[4] |
| Not HS | HS = painful nodules, abscesses, sinus tracts, scarring in intertriginous zones — different disease; FFD lacks true abscess/sinus network |
| First-line Rx | Topical clindamycin 1% BD + topical retinoid (tretinoin 0.025–0.1% or adapalene nocte); avoid retinoids in pregnancy; antihistamine for itch; consider COC with anti-androgenic progestin[1][2] |
| Refractory | IL steroid selected papules; PDT, electrocautery, CO2 laser, botulinum toxin in specialist hands; oral isotretinoin sometimes used carefully |
| Communication | Chronic relapsing; set realistic itch-control goals; exclude infection/HS if painful nodules appear |
Model key actions
- Diagnose apocrine miliaria by site + tiny pruritic papules + anhidrosis in young woman.[1]
- Start clindamycin + topical retinoid ± hormonal therapy; never retinoid in pregnancy.[1]
- Do not label as HS without nodules/sinuses/scarring.
Common errors
- Misdiagnosing HS and escalating to biologics unnecessarily.
- Using only emollient without follicular-targeted therapy.
- Topical retinoid in pregnancy.
- Missing that men/children/post-menopausal onset is atypical — rethink diagnosis.
References4ShowHide
- [1]Litchman G, Sonthalia S Fox-Fordyce Disease (Apocrine Miliaria). StatPearls, 2026.PMID 31424791
- [2]Miao C, Zhang H, Zhang M, et al. Fox-Fordyce disease. Dermatol Online J / review, 2018.PMID 29641729
- [3]Blasco-Morente G, Naranjo-Díaz MJ, Pérez-López I, et al. Fox-Fordyce Disease. N Engl J Med, 2016.PMID 26909204
- [4]Singal A, Kaur I, Jakhar D Fox-Fordyce Disease: Dermoscopic Perspective. Dermatol Pract Concept, 2020.PMID 32903893