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Wickham Striae (Lichen Planus)

What is Wickham Striae (Lichen Planus)?

Wickham striae are the characteristic, fine, white‑lacy lines or dots that appear on the surface of lesions caused by lichen planus, an inflammatory condition that targets the skin, mucous membranes, hair follicles and nails. The striae are most visible on the “flat‑topped” purple papules that typically develop on the wrists, shins, lower back, and oral cavity. While the name Wickham striae refers specifically to this surface pattern, it is most often used interchangeably with the term lichen planus in patient‑focused literature.

Lichen planus is considered an autoimmune‑mediated disease: the body’s immune system mistakenly attacks basal keratinocytes (skin cells) leading to inflammation and the classic lesions. The exact trigger is unknown, but a combination of genetic susceptibility, viral infections, medications, and chronic irritants is thought to play a role <sup>[1][2]</sup>.

Common Causes

Although the precise cause of lichen planus remains elusive, several factors have been linked to its onset or exacerbation. Below are the most frequently reported associations:

• Hepatitis C infection – one of the strongest epidemiological links (up to 30% of patients in some series) <sup>[3]</sup>.
• Medications – especially antihypertensives (ACE inhibitors, thiazide diuretics), non‑steroidal anti‑inflammatory drugs (NSAIDs), and antimalarials.
• Dental materials – metals such as amalgam, gold, and nickel can trigger oral lichen planus.
• Viral infections – herpes‑simplex virus, human papillomavirus (HPV), and Epstein‑Barr virus have been implicated.
• Genetic predisposition – certain HLA‑DQ alleles appear more often in affected individuals.
• Stress and hormonal changes – emotional stress or pregnancy may precipitate flares.
• Contact irritants – topical dyes, fragrances, or chronic scratching.
• Autoimmune diseases – such as thyroiditis, lupus erythematosus, or rheumatoid arthritis, can coexist.
• Heavy metal exposure – arsenic, lead, and mercury have been reported in isolated case series.
• Sunlight (UV) exposure – especially in individuals with photosensitive skin types, may worsen cutaneous lesions.

Associated Symptoms

Patients with Wickham striae often notice other clinical features that accompany the classic papules:

• Itching (pruritus) – the most common complaint; can be severe enough to disrupt sleep.
• Oral discomfort – burning or soreness on the tongue, inner cheeks, or gums (oral lichen planus).
• Nail changes – thinning, ridging, splitting, or the “pterygium” where skin grows forward from the nail base.
• Hair loss – scarring alopecia on the scalp when follicles are involved (lichen planopilaris).
• Genital lesions – erosive or erosive‑ulcerative plaques on the vulva or penis, sometimes confused with sexually transmitted infections.
• White‑lacy patches – especially on the buccal mucosa, often mistaken for candidiasis.
• Painful erosions – especially after trauma (e.g., brushing teeth), leading to secondary infection.

When to See a Doctor

Because lichen planus can affect multiple body sites and may signal an underlying systemic condition, prompt medical evaluation is essential when any of the following occur:

• New, persistent rash or oral lesions that do not resolve within two weeks.
• Severe itching that interferes with daily activities or sleep.
• Swelling, blistering, or ulceration of the mouth, genital area, or eyes.
• Visible nail changes or sudden hair loss.
• Signs of infection (increased redness, warmth, pus, fever).
• Known hepatitis C or other chronic viral infection without prior skin‑check.
• Any suspicion that a medication may be triggering the rash.

Diagnosis

Diagnosing Wickham striae / lichen planus involves a combination of clinical observation and, when needed, laboratory testing.

Clinical Exam

• Identification of the classic violaceous, flat‑topped papules with Wickham striae.
• Examination of oral cavity, nails, scalp, and genitalia for associated lesions.
• Documentation of distribution pattern (typically wrists, ankles, lower back, and mucosa).

Skin or Mucosal Biopsy

When the diagnosis is uncertain, a 4‑mm punch biopsy is taken. Histopathology typically shows:

• Band‑like lymphocytic infiltrate at the dermal‑epidermal junction.
• Degeneration of basal keratinocytes (“saw‑tooth” rete ridges).
• Hypergranulosis and Civatte bodies (necrotic keratinocytes).

Additional Tests

• Hepatitis C serology – recommended for all newly diagnosed patients.
• Complete blood count (CBC) and liver function tests if systemic medication is considered.
• Patch testing if a contact allergen is suspected.

Treatment Options

Therapy is aimed at relieving symptoms, limiting lesion spread, and preventing complications. Treatment plans are individualized based on location, severity, and patient comorbidities.

Topical Therapies

• High‑potency corticosteroids (e.g., clobetasol 0.05% ointment) – first‑line for cutaneous lesions; apply once daily for 2‑4 weeks.
• Topical calcineurin inhibitors (tacrolimus 0.1% or pimecrolimus 1%) – useful for oral or genital mucosa where steroids may cause thinning.
• Retinoids (tazarotene 0.05% cream) – helpful for hyperkeratotic lesions.

Systemic Medications

• Oral corticosteroids (prednisone 0.5‑1 mg/kg) – reserved for extensive or rapidly progressive disease.
• Antimalarials (hydroxychloroquine 200–400 mg daily) – effective for mucosal and cutaneous forms; monitor retinal toxicity.
• Immunosuppressants (mycophenolate mofetil, azathioprine) – for refractory cases.
• Biologic agents – emerging data support the use of dupilumab or secukinumab for recalcitrant disease.

Phototherapy

Narrow‑band UVB or psoralen‑UVA (PUVA) can improve widespread plaques, especially on the trunk and limbs. Treatment is usually administered 2‑3 times per week for 8‑12 weeks.

Supportive & Home Care

• Gentle skin care – fragrance‑free moisturizers to reduce barrier disruption.
• Avoidance of known triggers (e.g., specific dental alloys, certain medications).
• Use of soft toothbrushes and non‑alcoholic mouth rinses for oral lesions.
• Cool compresses or oatmeal baths to soothe itching.
• Stress‑reduction techniques (mindfulness, yoga) as psychological stress can precipitate flares.

Prevention Tips

While it is impossible to prevent every episode, the following strategies can lower the risk of new lesions or worsening of existing disease:

• Maintain regular dental check‑ups; ask for metal‑free restorations if you have oral lichen planus.
• Report new medications to your doctor; a pharmacist can help identify drugs associated with lichenoid reactions.
• Practice good sun protection – broad‑spectrum sunscreen SPF 30+ and protective clothing.
• Keep nails trimmed short to avoid trauma that could trigger nail involvement.
• Manage chronic hepatitis C or other viral infections under specialist care.
• Adopt a balanced diet rich in antioxidants (fruits, vegetables) which may help modulate immune response.
• Quit smoking; tobacco has been linked with more severe oral lichen planus.

Emergency Warning Signs

References

1. Mayo Clinic. Lichen planus: Symptoms and causes. https://www.mayoclinic.org. Accessed June 2026.
2. National Center for Biotechnology Information (NCBI). Pathogenesis of lichen planus. https://www.ncbi.nlm.nih.gov.
3. World Health Organization (WHO). Hepatitis C and extra‑hepatic manifestations. https://www.who.int. 2023.
4. Cleveland Clinic. Lichen planus treatment overview. https://my.clevelandclinic.org. Updated 2025.
5. Centers for Disease Control and Prevention (CDC). Managing medication‑induced lichenoid eruptions. https://www.cdc.gov.

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