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Pseudoporphyria secondary to narrowband UVB phototherapy for psoriasis
Carol Oh1, Brad Jones, Rustum Solomon
1Department of Dermatology, Our Lady of Lourdes Hospital, Drogheda, Ireland. caroloh@bigpond.net.au
Abstract:
A 59-year-old woman undergoing narrowband UVB phototherapy for treatment of psoriasis presented suddenly with tense blisters on both hips. The blisters were asymptomatic and disappeared within 24 hours. Histopathology together with a negative porphyrin screen made the diagnosis of pseudoporphyria. Blood tests including a full blood count, urea and electrolytes, liver function tests and antinuclear autoantibodies were normal. The patient was otherwise healthy; there was no history of extensive sun exposure, sunbeds or medication with non-steroidal anti-inflammatory drugs. This presentation of pseudoporphyria secondary to narrowband UVB radiation is unusual, as UVB radiation is not known to be associated with pseudoporphyria.
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