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The previously used make-up base could not be patch tested but similar products from the same brand were shown to contain isopropyl lauroyl sarcosinate. Keywords: allergic contact dermatitis; CAS no. 230309-38-3; case report; cosmetics; eczema; isopropyl lauroyl sarcosinate; patch test; repeated open application test; sodium lauroyl sarcosinate EN allergic contact dermatitis CAS no. 230309-38-3 case report cosmetics eczema isopropyl lauroyl sarcosinate patch test repeated open application test sodium lauroyl sarcosinate 119 120 2 06/17/21 20210701 NES 210701 We report a second case of allergic contact dermatitis caused by isopropyl lauroyl sarcosinate (CAS no. 230309-38-3), an amino acid-based ester, contained in a cosmetic.1 CASE REPORT A 35-year-old woman, with a history of chronic spontaneous urticaria and asthma, reported an erythematous and oedematous eruption of the face, with burning and itchy sensations, 24 hours following the application of Effaclar Duo+ (La Roche Posay, L'Oréal, Clichy, France) to treat acne. Allergic contact dermatitis, CAS no. 230309-38-3, case report, cosmetics, eczema, isopropyl lauroyl sarcosinate, patch test, repeated open application test, sodium lauroyl sarcosinate. [Extracted from the article]