A Case of Annular Atrophic Lichen Planus Associated with Hypertrophic Lichen Planus

Cho, Yu Kyung; Kim, Mi Yeon; Park, Chul Jong

Abstract

Hypertrophic lichen planus is the most pruritic variant of lichen planus, which is characterized by verrucous plaques with variable amounts of scales on the lower extremities, especially the shins. Annular atrophic lichen planus is the most unusual variant of lichen planus, resulting from the combination of both annular and atrophic features in the same lesions. The active border of the lesion shows the typical histopathologic findings of lichen planus, whereas its atrophic center exhibits histopathologic features of regression. A 29-year-old man presented with intermittently pruritic, multiple plaques and papules on the right thigh for 3 months. At first, small, polygonal papules and verrucous plaques developed above the right knee. In a short time, atrophic and hyperpigmented macules with raised and annular borders appeared along the line of Blascho. Histopathologic examination of verrucous plaque and annular atrophic macule revealed hypertrophic and annular atrophic lichen planus, respectively. We, herein, report an unusual case of annular atrophic lichen planus associated with hypertrophic lichen planus along the line of Blascho.