Eosinophilic Pustular Folliculitis: Symptoms & Treatment

Eosinophilic pustular folliculitis (EPF), also known as Ofuji disease, is a rare dermatological condition characterized by recurrent, itchy, dome-shaped papules and pustules centered on hair follicles, primarily affecting seborrheic areas such as the face, scalp, upper trunk, and proximal extremities.

What is eosinophilic pustular folliculitis?

Eosinophilic pustular folliculitis is an inflammatory disorder targeting the pilosebaceous units, first described by Ichiro Ofuji in 1970. It manifests as groups of small, pruritic (itchy) papules and pustules that arise suddenly and resolve spontaneously, only to recur in crops over weeks or months. The condition is rare, with higher prevalence reported in Japan, particularly among adult males, though cases occur worldwide across all ages and demographics.

EPF is distinguished from bacterial folliculitis by its sterile nature and eosinophil-dominated histology. It encompasses several variants: classic (idiopathic) EPF, HIV-associated EPF, and infantile EPF. These may represent a spectrum rather than distinct entities, as their underlying pathogenesis overlaps. Blood eosinophilia (elevated eosinophils) is common but not universal, occurring in up to 50-70% of cases, alongside possible elevations in IgE.

Who gets eosinophilic pustular folliculitis?

Classic EPF predominantly affects adults aged 20-50, with a male-to-female ratio of about 3:1, and is most common in Asian populations. HIV-associated EPF occurs in immunocompromised individuals, particularly those with advanced AIDS, and may improve with antiretroviral therapy (ART). Infantile EPF presents in newborns or infants under 1 year, often resolving spontaneously by age 3, and spares the face unlike adult forms.

• Classic EPF: Middle-aged Japanese males; recurrent flares without systemic symptoms.
• HIV-associated: Severely immunocompromised patients; extensive trunk involvement.
• Infantile: Neonates; trunk and extremities, self-limiting.

Risk factors include underlying immunosuppression, hematologic malignancies, or autoimmune dysregulation, though most cases are idiopathic.

What causes eosinophilic pustular folliculitis?

The exact etiology remains unknown, but immune dysregulation plays a central role, with eosinophils recruited to hair follicles via chemotactic factors. Hypotheses include:

• Abnormal cytokine production (e.g., IL-5, eotaxin) driving eosinophil infiltration.
• Follicular epithelial stress, possibly from microbial superantigens or drugs.
• In HIV cases, CD4+ T-cell depletion leads to unchecked eosinophilic inflammation.
• Associations with malignancies (e.g., lymphoma) or connective tissue diseases suggest paraneoplastic triggers.

No infectious agent is consistently identified; pustules are sterile on culture.

What are the clinical features of eosinophilic pustular folliculitis?

Lesions appear as monomorphic, 1-3 mm dome-shaped papules or fragile pustules on an erythematous base, grouped in annular or polycyclic patterns. They are intensely pruritic and favor seborrheic sites:

• Face (most common): Cheeks, forehead, perioral area; may mimic acne or rosacea.
• Scalp: Causes hair shedding and discomfort.
• Upper trunk and back: Extensor arms proximally.
• Rarely palms/soles (then termed eosinophilic pustular dermatosis).

Chronic scratching leads to excoriations, post-inflammatory hyperpigmentation, or prurigo nodularis. Systemic signs like fever or lymphadenopathy are absent in classic cases. Flares last 1-2 weeks, recurring unpredictably.

How is eosinophilic pustular folliculitis diagnosed?

Diagnosis relies on clinicopathologic correlation:

1. Clinical suspicion: Recurrent follicular pustules in seborrheic areas.
2. Laboratory: Peripheral eosinophilia (>500/mm³ in 50% cases), elevated IgE; rule out parasites, allergies.
3. Microbiology: Negative Gram stain, bacterial/fungal cultures from pustules.
4. Skin biopsy (gold standard): Intraepidermal eosinophilic pustules in follicular infundibulum, spongiosis, perivascular/perifollicular eosinophilic infiltrate; flame figures rare.

What is the treatment for eosinophilic pustular folliculitis?

Treatment is symptomatic and suppressive, as spontaneous remission is rare in adults. Options include:

• First-line: Indomethacin (25-50 mg/day orally); effective in 70% of classic cases via prostaglandin inhibition; rapid response in days.
• Corticosteroids: Oral prednisone (0.5-1 mg/kg/day, taper); potent but relapse-prone.
• Topicals: Potent steroids, tacrolimus 0.1% ointment for mild cases.
• Others: Dapsone, hydroxychloroquine, cyclosporine, minocycline; for refractory disease.
• Phototherapy: Narrowband UVB; suppresses inflammation.
• HIV-associated: ART as cornerstone.
• Infantile: Topical steroids; often self-resolves.

Antihistamines (e.g., cetirizine) aid pruritus. Maintenance low-dose indomethacin prevents flares.

What is the outcome for eosinophilic pustular folliculitis?

Classic EPF is chronic, relapsing over years, but benign without scarring or systemic progression. HIV cases improve with immune reconstitution. Infantile form resolves by puberty in 90%. Hyperpigmentation may persist post-resolution.

Frequently Asked Questions

Q: Is eosinophilic pustular folliculitis contagious?

A: No, EPF is non-infectious and sterile; pustules lack bacteria or fungi.

Q: Can EPF cause permanent hair loss?

A: Temporary shedding occurs, especially on scalp, but follicles recover without scarring.

Q: How long do EPF flares last?

A: Individual crops resolve in 7-14 days, but the condition recurs chronically.

Q: Is indomethacin safe long-term for EPF?

A: Yes, at low doses (25 mg/day); monitor GI side effects; superior to steroids for maintenance.

Q: Does EPF occur in children?

A: Yes, infantile EPF is a distinct, self-limited variant affecting infants under 1 year.

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Medha Deb is an editor with a master's degree in Applied Linguistics from the University of Hyderabad. She believes that her qualification has helped her develop a deep understanding of language and its application in various contexts.

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