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Localized bullous pemphigoid induced by photodynamic therapy

Localized bullous pemphigoid induced by photodynamic therapy

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Authors

  • Pariyawan Rakvit
  • Alastair C. Kerr
  • Sally Helen Ibbotson

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Info

Original languageEnglish
Pages251-253
Number of pages3
JournalPhotodermatology, Photoimmunology & Photomedicine
Journal publication dateOct 2011
Volume27
Issue5
DOIs
StatePublished
Peer-reviewedYes

Abstract

Topical photodynamic therapy (PDT) causes localized phototoxicity and has been shown both in vitro and in humans to have immunomodulatory and immunosuppressive effects. We report a case of localized bullous pemphigoid (BP) developing after PDT. Although BP has been reported to develop following cutaneous insults such as surgery, radiotherapy, psoralen ultraviolet A (PUVA) and ultraviolet B phototherapy, PDT has not previously been reported as a trigger. Possible mechanisms include direct mechanical injury to the basement membrane and subsequent autoantibody formation, an indirect immunomodulatory effect of PDT, or most likely, precipitation of BP in individuals with pre-existing low titres of epidermal autoantibodies (so-called subclinical BP). PDT should be added to the list of possible exogenous triggers for BP and this condition should be considered if blistering develops following PDT.

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