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Area of Science:

  • Dermatology
  • Photobiology
  • Allergology

Background:

  • Fentichlor causes frequent positive photopatch test reactions.
  • Its clinical relevance and current use remain unclear.

Purpose of the Study:

  • Review fentichlor's photopatch test data.
  • Characterize patients with fentichlor photosensitivity.
  • Investigate current fentichlor applications.

Main Methods:

  • Systematic review of photopatch test studies.
  • Retrospective chart review of photosensitive patients.
  • Inquiry to manufacturers regarding fentichlor uses.

Main Results:

  • Positive photopatch reactions to fentichlor ranged from 0.0% to 11.8%.
  • Fentichlor is manufactured/distributed by 25 global companies.
  • Common uses include research, high-throughput screening, and antimicrobial creams.

Conclusions:

  • Fentichlor is a potent photosensitizing allergen globally.
  • Its availability and use suggest potential incorporation into consumer products.
  • Recommend continued inclusion in standard photopatch test series.