SummaryBackground. Corticosteroids are among the most commonly used topical drugs. Contact allergy to these exists, but can be easily missed. Corticosteroid screening markers have been included in the baseline series with the aim of detecting most of the sensitized patients. Objectives. To assess the prevalence of contact allergy to topical corticosteroids in Spain and examine the usefulness of corticosteroid markers to detect contact allergy to corticosteroids. Methods. In total, 3699 patients referred to 20 dermatology departments across Spain for patch testing with the baseline series, including budesonide and tixocortol pivalate, were also tested with six supplementary corticosteroids (methylprednisolone aceponate, mometasone furoate, prednicarbate, clobetasol propionate, betamethasone 17-valerate, and betamethasone 17,21-dipropionate). Additionally, 2547 (68.8%) patients were tested with hydrocortisone 17-butyrate. Results. Fifty-four patients showed positive reactions to at least one of all tested corticosteroids (1.46%). Thirty-nine (1.05%) reacted to at least one of the additionally tested corticosteroids; among these, 24 of 39 (61.5%) did not react to any of the corticosteroid allergy screening markers tested. Conclusions. More than half of the patients who were allergic to the additionally tested corticosteroids were not detected with the corticosteroid allergy markers. An update of the corticosteroid allergy screening markers is encouraged, with consideration of group 3 corticosteroids.

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Background Metal allergies are the most frequent causes of allergic contact dermatitis. Although the use of palladium is increasing, it is not included in any baseline series. Objective To assess the prevalence of hypersensitivity to palladium and to describe the clinical and demographic characteristics of patients who are sensitized to palladium dichloride (PdCl2). Methods A single‐centre, retrospective study of 15 years of patch testing with the Spanish baseline series supplemented with PdCl2 2% pet. was performed. We collected clinical and demographic data and data on co‐sensitization among the metals studied, and we compared patients who were sensitized to palladium, with or without co‐sensitization to nickel, with the rest of the study population. Results Among the 3678 included patients, 730 (19.9%) were sensitized to nickel sulfate. The prevalence of sensitization to PdCl2 (n = 316, 8.6%) was higher than the prevalence of sensitization to potassium dichromate (n = 240, 6.5%) and similar to the prevalence of sensitization to cobalt chloride (n = 353, 9.6%). Only 26 (8.2%) of the patients sensitized to palladium were not co‐sensitized to nickel. The percentage of men and patients aged ≥40 years was higher in this subgroup than in the patients with nickel co‐sensitization. Conclusions Given the high prevalence of hypersensitivity to PdCl2, this metal salt should be included in the Spanish baseline series, notwithstanding the frequency of co‐sensitization to nickel.

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