Lichen planus - Anogenital in
See oral lichen planus for oral mucosal presentation and lichen planopilaris for scalp presentation.
Certain medications may cause a lichenoid drug eruption, which is indistinguishable from typical lichen planus.
L43.9 – Lichen planus, unspecified
4776004 – Lichen planus
- Psoriasis – Look for psoriasis at other classic body sites.
- Seborrheic dermatitis (genital lesions) – Look for well-demarcated plaques with greasy scale.
- Lichen sclerosus (vulvar lesions) – Look for porcelain white atrophic plaques with areas of hemorrhage.
- Granuloma annulare – Look for annular plaques without scale.
- Lichen simplex chronicus – Look for lichenification with exaggerated skin markings on glabrous areas of vulva only, often with excoriations.
- Kaposi sarcoma (KS) – Look in the mouth; oral KS plaques may be an early sign of visceral involvement.
- Tinea corporis – Look for annular scaly plaques.
- Pemphigus vulgaris – Look for erosions and blisters with positive Nikolsky's sign, Asboe-Hansen sign.
- Migratory glossitis (geographic tongue)
- Secondary syphilis – Look for ulcers and grey plaques in mucosa.
- Lichenoid drug eruption – The mucocutaneous eruption is widespread.
- Cicatricial pemphigoid – Look for blisters and erosions, scarring, and stricture formation in later stages.
- Desquamative vaginitis – Look for mucosal erythema, edema, and erosions.
- Plasma cell vulvitis – Look for well-circumscribed violaceous plaque, often on the vestibule.
- Erythema multiforme – Look for skin with target lesions, mucosal ulcers, and hemorrhagic crust.
- Squamous cell carcinoma – Look for well-demarcated plaques.
- Papular acantholytic dermatosis