Research Article: Lichen Planus Pigmentosus with True Melanocytic Nests: A Case Report with a Comprehensive Literature Review
Abstract:
Lichen Planus Pigmentosus (LPP) is an uncommon variant of lichen planus characterized by the development of dark greyish-brown macules and patches primarily affecting sun-exposed areas. Histologically, it presents with lichenoid interface dermatitis with many melanophages. In select cases, the presence of melanocytic nests or pseudomelanocytic nests within LPP lesions has been documented, posing a diagnostic challenge. We present a detailed case report of a 32-year-old Eritrean woman with a longstanding history of hyperpigmented macules, alongside an in-depth review of the existing literature on lichenoid dermatoses featuring melanocytic or pseudomelanocytic nests. This paper delves into the clinical presentation, histopathological features, differential diagnosis, and potential mechanisms underlying this intriguing phenomenon.
Introduction:
Lichen Planus Pigmentosus (LPP) is a distinctive subtype of lichen planus that predominantly impacts individuals with darker pigmented skin. Lichenoid interface dermatitis with many melanophages is the typical histopathological presentation [1]. The microscopic identification of pseudomelanocytic nests or true melanocytic nests within LPP lesions introduces complexity to the diagnostic process and stimulates inquiries into the intricate interplay between inflammatory processes and melanocyte biology.
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