Solar urticaria: report of two cases with augmentation spectrum

Area of Science:

• Dermatology
• Photobiology

Background:

• Solar urticaria is a rare photosensitivity disorder.
• Understanding its action and augmentation spectra is crucial for diagnosis and management.

Observation:

• Two adult Japanese patients with severe solar urticaria were studied.
• An action spectrum was identified in the visible light range for both patients.

Findings:

• An augmentation spectrum, longer than the action spectrum, was observed in the visible light range.
• Unlike previous reports, urticarial reactions were enhanced solely by postirradiation with the augmentation spectrum.

Implications:

• This finding expands the understanding of solar urticaria pathophysiology.
• It suggests novel diagnostic or therapeutic approaches targeting postirradiation effects.