Unilateral Distribution of Lichen Planus Pigmentosus-Inversus Unresponsive to Clobetasol and Hydroquinone.

Lichen planus pigmentosus-inversus (LPP-inversus) is a rare, pigmented variant of lichen planus of unknown etiology. This skin condition typically affects the intertriginous and flexural regions of the body bilaterally. We report an unusual case presentation with unilateral distribution of LPP-inversus in a woman originally from Nepal. The lesions developed rapidly over a three-month period and were recalcitrant to therapy with topical clobetasol and hydroquinone.