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Studying Chronic Exposure of Mice to Ultraviolet B Radiation
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Sweet's syndrome triggered by ultraviolet light.

Patricia Pérez-Feal1, Gabriela Pita da Veiga1, Noelia Moreiras-Arias1

  • 1Department of Dermatology, University Clinical Hospital of Santiago de Compostela, Spain.

Photodiagnosis and Photodynamic Therapy
|March 19, 2021
PubMed
Summary
This summary is machine-generated.

Photoinduced Sweet syndrome is rare but can be triggered by UV light and certain medications like hydrochlorothiazide. Phototests are crucial for diagnosing photodistributed Sweet syndrome cases.

Keywords:
Neutrophilic dermatosisPhotodistributedPhotoinducedPhotosensitivityPhototriggeredSweet syndrome

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Area of Science:

  • Dermatology
  • Immunodermatology

Background:

  • Sweet's syndrome, a neutrophilic dermatosis, is rarely triggered by environmental factors like ultraviolet (UV) radiation.
  • Understanding the role of environmental triggers is essential for comprehensive patient management.

Observation:

  • Two cases of photoinduced Sweet syndrome are presented.
  • The first patient developed photodistributed lesions, a positive phototest, and neutrophilic dermatosis histopathology while on hydrochlorothiazide.
  • The second patient's lesions were clearly UV-induced, consistent with Sweet's syndrome, and reproduced with narrow-band UV-B (nbUVB).

Findings:

  • The first patient's phototest normalized after discontinuing hydrochlorothiazide, indicating a combined effect of UV light and the drug.
  • The second case demonstrated photoinduced Sweet's syndrome with a decreased minimal erythemal dose (MED) and lesion reproduction upon nbUVB exposure.
  • Both patients underwent pathological photobiological studies confirming the findings.

Implications:

  • This study highlights the importance of considering UV light and medications as triggers for Sweet's syndrome.
  • Phototests should be performed in patients presenting with photodistributed Sweet's syndrome to identify potential environmental or drug-induced causes.
  • Early identification of photoinduced triggers can lead to appropriate management and prevention strategies.