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Lichen planus pigmentosus presenting in zosteriform pattern

S Cho¹, K K Whang

¹Department of Dermatology, College of Medicine, Ewha Womans University, Seoul, Korea.

The Journal of Dermatology

|March 1, 1997

Summary

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Lichen planus pigmentosus (LPP) typically presents as brown macules. This report details a rare case of LPP with a unilateral, zosteriform rash, bridging LPP and ashy dermatosis.

Area of Science:

Dermatology
Pathology

Background:

Lichen planus pigmentosus (LPP) is a skin condition of unknown cause, differing from classical lichen planus (LP).
LPP typically presents with dark brown macules/papules in sun-exposed or flexural areas, often without itch or specific LP-related site involvement.

Observation:

A 49-year-old man presented with a unilateral, zosteriform rash on his left flank.
Histopathological examination revealed epidermal thinning, a characteristic of LPP, alongside typical lichen planus changes.

Findings:

The observed zosteriform presentation of LPP is novel.
This case suggests LPP may exist on a spectrum with ashy dermatosis, challenging previous classifications.

Implications:

This case expands the clinical spectrum of Lichen Planus Pigmentosus.

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Further research is needed to understand the etiology and classification of LPP variants like the zosteriform pattern.