Vulvar Lichen Sclerosus
Chronic inflammatory vulvar dermatosis with porcelain-white plaques and architectural change.
Also known as: lichen sclerosus, LS, vulvar lichen sclerosus, kraurosis vulvae
Overview
Chronic, relapsing inflammatory dermatosis predominantly affecting the anogenital skin, characterized by thinning, depigmentation, and architectural destruction. Carries a 4-6% lifetime risk of vulvar squamous cell carcinoma if untreated.
Epidemiology
Bimodal distribution: prepubertal girls and postmenopausal women, with peak incidence in the 6th-7th decade. Female-to-male ratio ~10:1.
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Risk factors
- Autoimmune comorbidity (thyroid disease, vitiligo, pernicious anemia, alopecia areata, type 1 DM)
- Family history of LS
- Possible role of chronic occlusion, irritation, and Koebner phenomenon
Pathophysiology
Autoimmune process with T-cell-mediated injury to basal keratinocytes producing characteristic histology of hyperkeratosis, epidermal atrophy, basement membrane thickening, and a homogenous band of hyalinized collagen in the upper dermis with a lichenoid lymphocytic infiltrate beneath.
Clinical presentation
Symptoms
- Severe vulvar and perianal pruritus (most common; often worse at night)
- Burning, soreness, dyspareunia
- Dysuria, urinary symptoms
- Dyschezia and constipation if perianal involvement
- Children may present with constipation, dysuria, or behavioral changes; itching and visible findings may be missed
Signs / physical exam
- Porcelain-white, atrophic, crinkly ('cigarette-paper') plaques on labia minora, clitoral hood, and perianal area in a classic 'figure-of-8' or 'keyhole' distribution sparing the vagina
- Architectural change: resorption of labia minora, fusion of clitoral hood, narrowing of introitus
- Ecchymoses, fissures, and erosions are common
- Lichenification from scratching
Differential diagnosis
- Lichen planus — Erosive lesions, oral involvement, Wickham striae, more commonly with painful erosions and dyspareunia
- Lichen simplex chronicus — Thickened, leathery skin from chronic rubbing; pruritus prominent, architecture preserved
- Vitiligo — Symmetric depigmentation without atrophy or architectural change
- Atrophic vaginitis — Hypoestrogenic changes, no architectural destruction or porcelain plaques
- Vulvar intraepithelial neoplasia (VIN) / SCC — Persistent plaque, ulcer, or mass — biopsy any non-responding or atypical lesion
- Sexual abuse (pediatric) — LS can mimic with subepithelial hemorrhage; both require careful evaluation
Diagnostic workup
Diagnostic criteria
Clinical with characteristic appearance is usually sufficient. Punch biopsy is recommended for atypical features, treatment failure, or suspicion of malignancy.
Labs
- TSH (associated thyroid autoimmunity)
- Glucose if symptomatic
- No routine serologies otherwise
Imaging
- Not routinely indicated
Diagnostic algorithm
| Feature | Lichen Sclerosus | Lichen Planus | Lichen Simplex Chronicus |
|---|---|---|---|
| Typical location | Vulva, perianal (figure-of-8), not vaginal | Vulva, vagina, oral mucosa | Wherever scratched (often labia majora) |
| Appearance | White, atrophic, 'cigarette-paper' skin | Erosive, Wickham striae, painful | Thick, leathery, lichenified |
| Architecture | Resorbed labia minora, phimosis | Vaginal adhesions, synechiae | Preserved |
| First-line tx | Ultrapotent topical steroid (clobetasol) | Ultrapotent topical steroid | Mid-potency steroid + break itch-scratch cycle |
Treatment
First-line
- Ultrapotent topical corticosteroid — clobetasol propionate 0.05% ointment is the gold standard
- Typical regimen: nightly for 4 weeks, every other night for 4 weeks, twice weekly for 4 weeks, then maintenance 1-2 times weekly indefinitely
- Emollients (white petrolatum, zinc oxide) and irritant avoidance (no soaps, fragranced products, tight clothing)
- Treatment continues indefinitely — LS is chronic and requires maintenance to prevent flares and malignant transformation
- Follow up every 6-12 months for assessment of response and surveillance for malignancy
Second-line / adjunct
- Topical calcineurin inhibitors (tacrolimus 0.1% ointment, pimecrolimus 1% cream) — second-line; useful in steroid-resistant or maintenance therapy; FDA black-box warning for theoretical malignancy risk
- Intralesional triamcinolone for refractory areas
- Topical or systemic retinoids in select cases
- Surgery limited to release of agglutination causing functional impairment, treatment of suspected malignancy, or vulvar cancer; surgical excision alone does not cure LS
Complications
- Vulvar squamous cell carcinoma (4-6% lifetime risk if untreated; HPV-independent pathway)
- Architectural distortion: labial resorption, clitoral phimosis, introital stenosis
- Sexual dysfunction, dyspareunia
- Psychological impact: depression, anxiety
- Adhesions causing urinary obstruction in advanced disease
PANCE pearls
- Ultrapotent topical steroids are SAFE for long-term use on vulvar skin — undertreatment is far more harmful than steroid side effects.
- Always biopsy a non-responding, ulcerated, hyperkeratotic, or persistent plaque on lichen sclerosus skin — vulvar SCC arises in this background.
- LS spares the vagina; if vaginal involvement is present, consider lichen planus.
- Pediatric LS often improves at puberty but should still be treated to prevent architectural change and malignancy risk.
- Topical estrogen does NOT treat LS and may delay diagnosis if used empirically — biopsy and steroids are the foundation.
References
- ACOG CO 845 — ACOG Committee Opinion: Diagnosis and Management of Vulvar Skin Disorders (Obstet Gynecol)
- BAD 2018 — British Association of Dermatologists Guidelines for Lichen Sclerosus (Lewis et al., 2018)
- ISSVD — International Society for the Study of Vulvovaginal Disease terminology
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