Lichen Planus Pigmentosus Inversus: case report and systematic review
Accepted: 31 August 2024
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Lichen Planus Pigmentosus Inversus (LPPI) is a rare variant of lichen planus characterized by well-demarcated, often slight pruritic, dark-gray plaques in intertriginous zones, hence the attribute of “inversus”, originally described by Pock et al. in 2001. Less than 100 cases have been reported to date, and here we present a case in a 52-year-old male who presented with two months duration of grey-brownish plaques in bilateral axillary, submammary, antecubital, and inguinal folds. No triggering agent was present, and the biopsy showed an interface/lichenoid dermatitis with plenty of pigment incontinence. Topical tacrolimus 0.1% ointment was administered with moderate improvement at five weeks. A review of the literature showed no significant differences in involved sites and age distribution among genders, with a slightly longer duration of manifestations in females. The most administered therapeutic agents were topical corticosteroids, alone or in combination with other agents, and tacrolimus.
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