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Lichen planus (LP) is a chronic inf lammatory disease of the skin and mucosa. Of the vari- ous types, the hypertrophic type is characterized by thickened, purplish hyperkeratotic plaques and nodules. The course of hypertrophic LP tends to be more chronic than those of other types. A 12-year-old girl presented with a 2-year history of warty papules and plaques in a zosteriform configuration along one f lank. Histopathology revealed hyperkeratosis and papillomatosis with wedge-shaped hypergranulosis. A lichenoid lymphocytic infiltrate with vacuolar change in the basal layer was evident. She was prescribed oral doxycycline, a topical corticosteroid, and tacrolimus. After 7 weeks, the skin lesions became significantly f lattened and faded. LP is less common but more severe in children than in adults. The uni- lateral, linear hypertrophic type of LP is uncommon. Herein, we report a rare case of linear hypertrophic LP in a child.
