Hypertrophic Lichen Planus That Occurred in an Elderly Woman

Lichen planus is a chronic papulosquamous disease that affects the skin and mucous membranes. It is characterized by pruritic violaceous papules that are most commonly seen on the extremities of middle aged adults, but the elderly are rarely affected. Hypertrophic lichen planus usually occurs on the extremities and especially on the shins, and it tends to be the most pruritic variant. An 82-year-old female presented with severe pruritic multiple papules and plaques on the both the upper and lower extremities for 1 year. At first, the lesions began as small, polygonal papules that formed verrucous plaques over several months. Histopathologic examination showed marked hyperkeratosis, irregular acanthosis and wedge-shaped hypergranulosis. The vacuolar alteration and the lymphocytic inflammatory infiltrate were accentuated at the base of the rete ridge. From these findings, we diagnosed these lesions as hypertrophic lichen planus. The lesions were treated with topical steroid and intralesional injection of steroid, and they were slightly improved after 2 months of therapy. (Korean J Dermatol 2011;49(1):82~85