Ultraviolet-induced Fluorescence Patterns in Psoriasis: Insights from a Large International Cohort Study

Area of Science:

• Dermatology
• Medical Imaging

Background:

• Psoriasis presents diverse clinical features, sometimes complicating diagnosis.
• UV-induced fluorescence dermatoscopy (UVFD) offers a novel, complementary diagnostic approach for inflammatory skin conditions.
• Limited understanding exists regarding red fluorescence in psoriasis, its clinical correlations, and environmental influences.

Purpose of the Study:

• To investigate UVFD fluorescence patterns in psoriasis.
• To correlate fluorescence with patient demographics, geographic location, disease subtype, and morphology.
• To examine the influence of Psoriasis Area and Severity Index (PASI) score, season, and bathing habits on fluorescence.

Main Methods:

• Analysis of 356 UVFD images from 111 treatment-naive psoriatic patients in Central/Southern Europe.
• Exploration of fluorescence patterns against demographic, geographic, clinical, and environmental factors.
• Statistical analysis using Chi-squared tests and independent samples t-tests.

Main Results:

• Red fluorescence was more prevalent in sun-protected areas and in patients with higher PASI scores, particularly with erythema and induration.
• Geographic and seasonal variations in fluorescence were noted.
• Age, sex, and bathing practices did not significantly impact fluorescence patterns.

Conclusions:

• Red fluorescence in psoriatic lesions under UVFD is diminished by sun exposure.
• The presence and intensity of red fluorescence correlate with psoriasis severity.