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Contact allergy trends in Singapore – a retrospective study of patch test data from 2009 to 2013

We retrospectively analysed patch test results of the National Skin Centre, Singapore, between 1 January 2009 and 31 December 2013. We included all patients with suspected allergic contact dermatitis who were tested with a modified European baseline series. Patch testing was performed by the use of Finn Chambers® on Scanpor® tape, with allergens from Chemotechnique Diagnostics (Vellinge, Sweden), and exposure on the back for 48 h. Reading of the tests was performed on day (D) 3 and D7, according to the recommendations of the ICDRG (1).