Also known as: hypertrophic lichen planus

Clinical Features:

• Represents lichen simplex chronicus superimposed on lichen planus
• Most common on the lower extremities, especially the shins
• Presents as heavily pigmented warty plaques
• Increased incidence in familial lichen planus
• Controversial small risk of malignant transformation

Histologic Features:

• Similar features to classic lichen planus, with more pronounced hyperkeratosis and acanthosis
• Pseudoepitheliomatous hyperplasia may sometimes be seen, mimicking squamous cell carcinoma.
• The lymphocytic infiltrate my sometimes partially spare the papillary dermis.
• Dermal scarring may occur.

Cases associated with this book:

Lichen planus hypertrophicus
Author: Stephen Lyle, M.D., Ph.D.

Conference: DermatopathologyConsultations.com Teaching Collection