Sean Klepper M.D.
Stephen Lyle, M.D., ...
Also known as: hypertrophic lichen planus
- 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
- 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.