A 30-year-old woman with no history of allergies or atopy presented with pruritic linear erythematous plaques distributed along the area of the bikini straps after wearing a wet bikini for several hours (Fig. 1A). Since allergic contact dermatitis (ACD) was suspected, patch testing was performed with the European Baseline Series, textile and rubber additives series and the dry bikini ‘as is’. Positive reactions were found to the bikini straps ‘as is’ and to several rubber additives including Mercapto mix (+) and 2-Mercaptobenzothiazole 2.0% pet (+) (Fig. 1B), confirming the diagnosis of ACD. Textile contact dermatitis is a common condition caused by different allergens and irritants.1

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