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Thermosensitive lichen amyloidosis.

Kurosh Parsi1, Steven Kossard

  • 1Skin & Cancer Foundation Australia, Darlinghurst, NSW, Australia.

International Journal of Dermatology
|December 1, 2004
PubMed
Summary
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Lichen amyloidosis distribution may be influenced by skin temperature. Cooler areas showed more amyloid deposits, while warmer areas were spared, suggesting a thermosensitive pattern.

Area of Science:

  • Dermatology
  • Medical Research

Background:

  • A 26-year-old male with a 3-year history of lichen amyloidosis presented with a unique pigmented papular eruption.
  • The eruption displayed a ripple pattern on the limbs and trunk, notably sparing areas like the neck, face, axillae, and central chest.
  • Prominent sparing was also observed over the superficial veins of the limbs, suggesting a potential role for cutaneous temperature.

Observation:

  • Infrared thermography revealed that areas with higher skin temperatures (neck, axillae, superficial veins) were spared from amyloid deposits.
  • Conversely, cooler areas, such as the extensor surfaces of the arms and legs, corresponded with amyloid deposition.
  • Narrow-band ultraviolet B (NBUVB) phototherapy over five months led to significant improvement in itching and clearing of amyloid deposits.

Findings:

Related Experiment Videos

  • Lichen amyloidosis exhibited a thermosensitive distribution in this patient.
  • Amyloid deposits were inversely correlated with cutaneous temperature.
  • The findings align with in vitro studies on the thermosensitivity of amyloid fibril formation.

Implications:

  • The thermosensitive nature of lichen amyloidosis may influence its clinical presentation.
  • This observation could have implications for treatment strategies in a subset of patients.
  • Understanding the role of temperature in amyloid deposition may open new therapeutic avenues.