Diagnosis: Classic cutaneous lichen planus
A 45-year-old female presents with a 3-month history of pruritic, violaceous, polygonal papules primarily located on the flexor surfaces of her wrists. The lesions are characterized by their distinctive morphology, and the patient reports significant itching that has affected her quality of life.
A 45-year-old female presents with a 3-month history of pruritic violaceous polygonal papules on her flexor wrists. Upon examination, the lesions are well-defined, shiny, and exhibit a characteristic lace-like pattern known as Wickham's striae. The patient reports that the itching is severe and has led to scratching and secondary excoriations.Lesion morphology: Violaceous, polygonal papules with a shiny surface.Distribution: Predominantly on the flexor surfaces of the wrists.Associated symptoms: Significant pruritus leading to discomfort.Wickham's striae: Presence of white, lacy lines on the surface of the papules.Secondary changes: Scratching has resulted in excoriations and post-inflammatory hyperpigmentation.
The patient reports that the lesions began approximately three months ago following a stressful period at work. She has no significant past medical history and denies any family history of skin disorders. The patient has not tried any topical treatments prior to this visit. She is a non-smoker and has no known allergies.Onset: Symptoms began after a stressful life event.Triggers: Stress is the suspected trigger for the onset of lesions.Past treatments: No prior treatments attempted.Medical history: No significant past medical history.Family history: No family history of similar skin conditions.Social history: Non-smoker, no recreational drug use.
Acute / First-Line ManagementTopical corticosteroids: High-potency corticosteroids such as clobetasol propionate 0.05% ointment applied twice daily are effective for localized lesions.Oral antihistamines: For symptomatic relief of pruritus, consider cetirizine 10 mg daily.Moisturizers: Regular use of emollients to maintain skin hydration and barrier function.Workup and Diagnostic ConfirmationClinical diagnosis: Based on characteristic clinical features and history.Skin biopsy: Considered if the diagnosis is uncertain or if atypical features are present; typically shows a band-like infiltrate of lymphocytes at the dermal-epidermal junction.Consider serologic tests: If associated systemic symptoms or lesions are present, to rule out hepatitis C or other systemic conditions.Long-Term ManagementTopical corticosteroids: Continue for 4-6 weeks, then taper based on response.Phototherapy: Narrowband UVB may be beneficial for generalized or recalcitrant cases.Systemic therapies: In severe cases, consider systemic corticosteroids or retinoids.Regular follow-up: Monitor for potential complications and disease progression.
Psoriasis: Typically presents with well-defined plaques covered by silvery scales; commonly affects extensor surfaces and may show nail involvement.Granuloma annulare: Characterized by annular plaques, often on the dorsal surfaces; usually asymptomatic and self-limiting.Dermatophyte infections: Fungal infections may mimic lichenoid lesions; KOH prep or culture can confirm the diagnosis.Drug-induced lichenoid eruptions: Certain medications (e.g., antihypertensives) may induce similar lesions; medication history is crucial.Secondary syphilis: May present with papular lesions; serologic testing can differentiate.Contact dermatitis: Erythematous papules may arise from allergen exposure; history and patch testing can assist in diagnosis.Viral exanthems: Certain viral infections can cause lichenoid eruptions; consider in the context of systemic symptoms.Cutaneous lupus erythematosus: May show similar lesions but typically presents with photosensitivity and systemic symptoms.
High-Yield PearlsClassic presentation: Lichen planus typically presents as pruritic, violaceous, polygonal papules, often on flexor surfaces.Wickham's striae: The presence of white, lacy lines is a key diagnostic feature.Triggers: Stress is a common precipitating factor; inquire about psychosocial stressors during history taking.Histology: A band-like infiltrate of lymphocytes at the dermal-epidermal junction is characteristic of lichen planus.Management: First-line treatment includes high-potency topical corticosteroids; systemic therapies are reserved for severe cases.Understanding the classic features and triggers of lichen planus is crucial for effective diagnosis and management.
Tags: lichen planus, lichenoid