Lichen Planus Pigmentosus and Its Variants: Review and Update

    October 2017 in “ International Journal of Dermatology ”
    Juan Carlos Robles-Méndez, Paulina Rizo-Frías, Maira Elizabeth Herz‐Ruelas, Amit G. Pandya, Jorge Ocampo Candiani
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    TLDR Lichen planus pigmentosus causes dark skin patches and is treated by avoiding triggers and using anti-inflammatory medications.
    Lichen planus pigmentosus (LPP) was a rare variant of lichen planus characterized by dark brown to gray pigmentation on sun-exposed areas, primarily affecting dark-skinned individuals. It involved an inflammatory response leading to pigmentary incontinence and was linked to factors like hepatitis C, sun exposure, and certain contactants. Variants included LPP-inversus, affecting flexural areas, and LPP along Blaschko's lines, associated with genetic mosaicisms. LPP could co-occur with other LP variants and autoimmune diseases. Treatment focused on avoiding triggers and using medications to reduce inflammation and pigmentation, thereby improving appearance and quality of life.
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