Affiliation:
1. Occupational Medicine Instituto Português de Oncologia Coimbra Portugal
2. Allergy and Clinical Immunology Unit Centro Hospitalar Universitário de Coimbra Coimbra Portugal
3. Dermatology Unit Centro Hospitalar e Universitário de Coimbra Coimbra Portugal
4. Coimbra Institute for Clinical and Biomedical Research (iCBR), Faculty of Medicine University of Coimbra Coimbra Portugal
5. Dermatology, Faculty of Medicine University of Coimbra Coimbra Portugal
Abstract
AbstractBackgroundPhotopatch testing has been standardized for diagnosing photoallergic contact dermatitis but is still infrequently used.ObjectivesTo characterize photopatch test (PPT) results and their clinical relevance.MethodsWe collected retrospective data from patients photopatch tested in our Dermatology Unit (2010–2021), using the European PPT ‘baseline’ series, other allergens, and patient's own products, when appropriate.ResultsOut of 223 patients, 75 patients (33.6%) were reactive with 124 positive PPT reactions, considered relevant in 56/223 patients (25.1%) and in 72/124 reactions (58.1%). Most reactions were caused by topical drugs (n = 33; 45.8%), such as ketoprofen or promethazine, and 7 (9.8%) by systemic drugs, such as hydrochlorothiazide and fenofibrate. ‘Classical’ ultraviolet filters were responsible for six positive PPT reactions whereas there was only three relevant PPT to the ‘newer’ UV filters. Patients' sunscreens/cosmetics or plant extracts caused 10 positive PPT each. Additional patch test reactions were observed, mostly to Tinosorb® M.ConclusionContrary to the trend in ACD, most positive PPT reactions were caused by topical drugs, outweighing ultraviolet filters and cosmetics. We stress the low reactivity to the ‘newer’ UV filters included in the PPT series. PPT was occasionally positive in systemic drug photosensitivity, but overall PPT reactivity was low.
Subject
Dermatology,Immunology and Allergy
Cited by
3 articles.
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