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Patch testing in actinic prurigo.

P R Lane1, V L Harms, D J Hogan

  • 1Department of Medicine, University of Saskatchewan, Saskatoon, Canada.

Contact Dermatitis
|October 1, 1989
PubMed
Summary
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Actinic prurigo patients in Saskatchewan showed few positive reactions to plant extracts, suggesting plant contact dermatitis is not a common cause of this condition in the region.

Area of Science:

  • Dermatology
  • Allergology
  • Immunology

Background:

  • Actinic prurigo is a specific type of photosensitivity disorder.
  • Distinguishing actinic prurigo from other dermatoses, such as plant contact dermatitis, is crucial for accurate diagnosis and treatment.

Purpose of the Study:

  • To investigate the prevalence of positive patch test reactions to common allergens and plant extracts in Saskatchewan Indigenous individuals diagnosed with actinic prurigo.
  • To determine if plant contact dermatitis is a potential misdiagnosis for actinic prurigo in this population.

Main Methods:

  • Patch testing was performed on 42 Saskatchewan Indigenous individuals with actinic prurigo using standard allergen series and extracts of local Saskatchewan plants plus commercial plant extracts.
  • Data on positive reactions, including specific allergens and patient demographics (sex), were recorded between 1983 and 1987.

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Main Results:

  • Nickel and colophony were the most frequent positive reactions to standard allergens (nickel: 3F:2M; colophony: 3M).
  • Only three patients (1M, 2F) had positive patch tests to plant extracts, and none presented with characteristic eyelid, retroauricular, or submental rashes.

Conclusions:

  • Plant contact dermatitis is unlikely to be confused with actinic prurigo in Saskatchewan Indigenous populations.
  • The study highlights the importance of specific allergen testing in differentiating dermatological conditions.