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The Scandinavian multicenter photopatch study 1980-1985: final report.

P Thune1, C Jansén, G Wennersten

  • 1Ullevaal Hospital, Oslo, Norway.

Photo-Dermatology
|December 1, 1988
PubMed
Summary
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Photopatch testing on 1993 patients revealed polymorphic light eruption (PLE) as the most common photodermatosis. Secondary aggravation of skin diseases and photocontact dermatitis were also significant findings in sun-related skin conditions.

Area of Science:

  • Dermatology
  • Photobiology
  • Allergology

Background:

  • Photodermatoses affect a significant number of patients presenting to dermatology clinics.
  • Understanding the specific causes and triggers of these conditions is crucial for diagnosis and management.

Purpose of the Study:

  • To analyze the results of photopatch testing in a large cohort of patients with suspected photodermatosis.
  • To identify the most common causes of sun-related skin conditions and contact sensitivities.

Main Methods:

  • Photopatch testing was conducted on 1993 patients across 16 dermatology clinics in Scandinavia between 1980 and 1985.
  • Standard series, including the SPDRG standard series, were used to assess reactions to various substances and UV light.

Main Results:

Related Experiment Videos

  • Polymorphic light eruption (PLE) was the most frequent diagnosis (38%).
  • Secondary aggravation of existing skin diseases occurred in 16% of patients.
  • Photocontact dermatitis (11%) and contact dermatitis (10%) were identified, with specific allergens like musk ambrette and para-aminobenzoic acid noted as common photosensitizers.

Conclusions:

  • Photopatch testing is a valuable diagnostic tool for identifying causes of photodermatosis and contact sensitivities.
  • Specific allergens and photosensitizers were identified, informing potential avoidance strategies.
  • Further investigation into photosensitization mechanisms and sunscreen sensitivity is warranted.