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Lichen planus pigmentosus.

Evan Rieder1, Jennifer Kaplan, Hideko Kamino

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Summary
This summary is machine-generated.

Lichen planus pigmentosus (LPP) is a rare skin condition causing dark patches, often on sun-exposed areas. This case highlights unusual inflammatory and ring-like lesions in LPP.

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Area of Science:

  • Dermatology
  • Pathology

Background:

  • Lichen planus pigmentosus (LPP) is an uncommon variant of lichen planus.
  • It typically affects middle-aged individuals with darker skin tones.
  • Characterized by hyperpigmented macules and patches in sun-exposed areas.

Observation:

  • Presents a unique case of LPP with atypical clinical features.
  • The initial presentation involved an unusual inflammatory phase.
  • Subsequent development of circinate (ring-shaped) lesions with central clearing was observed.

Findings:

  • Histopathologic features include epidermal atrophy and vacuolar degeneration of the basal cell layer.
  • Perivascular lymphohistiocytic infiltrate and dermal melanophages are characteristic.
  • This case demonstrates variations from typical LPP presentations.

Implications:

  • Highlights the diverse clinical spectrum of Lichen planus pigmentosus.
  • Emphasizes the importance of considering atypical presentations in diagnosis.
  • Contributes to understanding the varied manifestations of this pigmentary disorder.