The patch-test result was negative, but the photopatch-test result showed photoallergic contact dermatitis from 6-methylcoumarin (++ reaction) and usnic acid (+ reaction) on the irradiated side ...
This report describes the first case in which photoallergic contact sensitization to 6-methylcoumarin may play an important role in the pathogenesis of poikiloderma of Civatte.
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