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Polymorphous Light Eruption.

Marcella Guarrera1

  • 1University of Genoa, Genoa, Italy. guarrera@unige.it.

Advances in Experimental Medicine and Biology
|November 11, 2017
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Summary
This summary is machine-generated.

Polymorphous light eruption (PLE) is a common UV-induced skin condition. Diagnosis involves history, morphology, and phototests, with treatments including sunscreens and corticosteroids.

Keywords:
Idiopathic photodermatosisImmunomediated photodermatosisMinimal erythema dosePhotoprovocation testsPhototestsPolymorphous light eruptionUV light

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Area of Science:

  • Dermatology
  • Photodermatology
  • Immunology

Background:

  • Polymorphous light eruption (PLE) is the most frequent immuno-mediated photodermatosis.
  • It manifests as a reaction to solar or artificial UV-light exposure on sun-exposed skin.
  • Lesions vary morphologically and typically resolve within a week without lasting effects.

Purpose of the Study:

  • To summarize the key aspects of Polymorphous Light Eruption (PLE).
  • To outline diagnostic criteria and potential therapeutic strategies for PLE.
  • To describe the clinical presentation and pathophysiology of PLE.

Main Methods:

  • Diagnosis relies on patient history, clinical morphology, and phototests.
  • Provocative phototests using UVA or UVB can reproduce lesions in approximately 50% of patients.
  • Minimal erythema dose (MED) is typically normal.

Main Results:

  • PLE lesions appear hours to days after UV exposure and vary from erythema to papules, blisters, and plaques.
  • The condition is thought to be a delayed hypersensitivity reaction to UV-induced antigens.
  • Phototests confirm diagnosis in about half of affected individuals.

Conclusions:

  • PLE is a common, UV-triggered skin condition diagnosed through clinical evaluation and phototests.
  • Preventive measures include broad-spectrum sunscreens, antioxidants, and photohardening.
  • Treatment primarily involves topical or systemic corticosteroids.