Folliculitis Decalvans – Specialist Diagnosis & Treatment for Scarring Scalp Conditions in London

Understanding Folliculitis Decalvans

Folliculitis decalvans sits within the family of cicatricial (scarring) alopecias—conditions in which inflammation destroys the permanent part of the follicle (the stem‑cell niche). FD is classically a neutrophilic process: neutrophils infiltrate the follicular unit, often in response to a dysregulated immune reaction to resident bacteria, most commonly Staphylococcus aureus. As episodes repeat, inflamed follicles rupture, adjacent tissue is damaged, and replacement fibrosis (scar tissue) forms. Clinically, patients experience clusters of pustules and crusting with pain, burning or itch, then progressive patchy hair loss. The “tufted hair” sign—a bundle of multiple hair shafts emerging from an enlarged follicular opening—is highly suggestive of FD.

Causes and Risk Factors

FD is multifactorial. The following elements likely contribute, in varying combinations for each patient:

• Abnormal immune response: An exaggerated host reaction to bacteria within the follicle amplifies neutrophil‑driven damage.
• Microbiological factors: S. aureus is often cultured; biofilms may shield bacteria and perpetuate inflammation.
• Mechanical triggers: Scratching, traction hairstyles, tight headwear or friction can aggravate active areas.
• Skin barrier & microbiome: Barrier compromise and local flora shifts likely influence severity and recurrence.
• Individual susceptibility: Genetic and immunological differences may explain why some patients relapse more readily.

Symptoms and Signs

• Painful or tender scalp, often with a burning sensation during flares.
• Pustules and yellow crusting, usually perifollicular.
• Perifollicular erythema and scale at the margins of active patches.
• Tufted hairs—several shafts exiting a single, dilated follicular opening.
• Irregular bald patches with shiny, smooth scarred skin and absent follicular openings.
• Itch or soreness, aggravated by friction, heat or occlusion.

How We Diagnose FD Safely

Several scalp disorders mimic each other, so accurate diagnosis is crucial. Your appointment includes a detailed history (onset, triggers, prior antibiotics, associated skin concerns) and gentle scalp examination with trichoscopy—magnified visualisation of follicular openings, scale, and vascular patterns. In FD, we often see tufting, pustules, and “poly‑trichia” (many hairs per ostium).

We commonly take a bacterial swab from active pustules to look for S. aureus and guide antimicrobial choices. A small scalp biopsy from the inflamed edge (where follicles are still present) is frequently recommended to confirm a neutrophilic scarring alopecia and to exclude lichen planopilaris (a lymphocytic scarring alopecia) or discoid lupus. Baseline photos and, where appropriate, digital hair analysis help us track response over time.

Differential Diagnosis (Common Lookalikes)

• Lichen planopilaris (LPP): Burning, perifollicular scale and topping; less pustulation; lymphocytic pattern on biopsy.
• Dissecting cellulitis: Deep nodules/abscesses with sinus tracts; can coexist with acne conglobata syndromes.
• Folliculitis keloidalis (acne keloidalis nuchae): Keloidal papules on the nape; see folliculitis keloidalis.
• Tinea capitis (kerion): Painful inflammatory fungal infection; requires antifungal therapy rather than antibiotics.
• Bacterial folliculitis: Superficial, non‑scarring; settles with short courses and antiseptic care.
• Erosive pustular dermatosis: Mainly in older adults after trauma or surgery; crusted erosions on the scalp.

Treatment Pathway: Induction, Consolidation, Maintenance

Because FD scars, treatment focuses on (1) stopping active destruction and (2) preventing new flares. Regrowth in scarred areas is not expected; the aim is to preserve remaining follicles, reduce pain/itch and improve quality of life. Plans are individualised based on your history, examination and investigations.

1) Antimicrobial Strategy

• Oral antibiotics: Courses with anti‑inflammatory and anti‑staphylococcal action are typical. Regimens and durations are selected by your consultant and adjusted to response and tolerability.
• Topical antiseptics: Antiseptic washes (for example, chlorhexidine‑based) during flares can reduce surface bacterial load and crusting.
• Decolonisation: If swabs repeatedly show S. aureus, targeted measures may be discussed as part of relapse prevention.

2) Anti‑inflammatory & Immunomodulating Measures

• Topical corticosteroids: Potent steroid solutions/foams can settle active margins in short, time‑limited bursts.
• Intralesional corticosteroids: Tiny, targeted injections at painful, inflamed edges reduce local activity and tenderness.
• Systemic anti‑inflammatories: For resistant disease, consultant‑supervised options may be considered to calm the immune response and maintain remission.

3) Scalp‑Care Support

• Medicated shampoos: Keratolytic or antimicrobial shampoos help lift crusts and improve comfort.
• Emollients: Soften adherent crusts before gentle cleansing; avoid forceful picking.
• Itch/pain strategies: Cooling, non‑fragrant products and measured analgesia (as advised) support sleep and daily activity.

4) Hair Restoration Discussions

Hair transplantation is generally not considered until disease has been inactive for a prolonged period and, ideally, biopsy confirms quiescence. Even then, careful risk–benefit discussion is essential, as relapse could jeopardise grafts. Cosmetic camouflage and styling are often the first step.

What to Expect: Timeline, Reviews and Relapse Planning

• Induction (first 8–12 weeks): Aim to stop pustules and pain, quieten edges and reduce crusting. You’ll receive clear written guidance.
• Consolidation: As flares settle, we taper to the lowest effective plan that maintains control.
• Maintenance: Periodic reviews, with photography or digital hair analysis if helpful.
• Relapse protocol: Because FD can recur, we agree exactly what to start at the first sign of a flare, and how to contact us promptly.

Lifestyle & Self‑Care Tips

• Use lukewarm water and gentle pressure; soften crusts with emollient before washing.
• Keep nails short; avoid scratching. Consider a soft scalp brush for shampooing.
• Reduce friction/occlusion during flares (tight helmets, caps). Line headwear with soft fabric if needed.
• Choose fragrance‑low, simple routines to reduce irritant overlap with inflamed skin.
• Address contributory scalp issues (dandruff/seborrhoeic dermatitis) to improve comfort—see seborrhoeic dermatitis and scalp conditions.

Quality of Life and Confidence

Scarring alopecias can affect self‑image and mood. We discuss realistic expectations early, offer practical styling/camouflage advice while treatment takes effect, and liaise with your GP when additional wellbeing support would help. Our goal is control of disease and restored day‑to‑day confidence.

How Skinhorizon Helps

• Consultant‑led trichology: Accurate differentiation of FD from other scarring alopecias using trichoscopy and targeted biopsy.
• Evidence‑based protocols: Structured induction → consolidation → maintenance, with flare plans and safety monitoring.
• Joined‑up care: Management of overlaps such as scalp infections, secondary dermatitis or pain/itch cycles.
• Communication: Clear written plans, early check‑ins, and accessible review appointments.

Your First Visit — What to Expect

1. History & goals: Onset, triggers, prior treatments, pain/itch pattern, and what you want to achieve.
2. Examination: Gentle scalp exam with trichoscopy to map active/inactive zones.
3. Investigations: Targeted swab during a flare; often a margin biopsy to confirm the scarring type.
4. Plan: Induction regimen (antimicrobial + anti‑inflammatory), scalp‑care guide, and a written flare protocol.
5. Start & follow‑up: Many patients begin therapy the same day; an early review checks comfort and response. We then step down to maintenance once stable.

Reviewed by: Dr Mohammad Ghazavi, Consultant Dermatologist
Skinhorizon Clinic, 4 Clarendon Terrace, Maida Vale, London W9 1BZ
Last reviewed: 21 August 2025