Lichen planus with predominant plasma cell infiltrate.

We herein report the case of a patient with lichenoid plaques on the lower extremities and anonychia of all toenails. Histologically, the eruption showed typical features of lichen planus, with the exceptional finding of a lichenoid infiltrate composed mostly of plasma cells. Only two other similar cases have been reported. The explanation for the numerous plasma cells remains unknown although such cases may represent a new histologic variant.