A proprietary sunscreen-induced photosensitivity reactions in a small number of users. Laboratory study revealed that the reactions were of the photoallergic type and were due to the presence of a synthetic fragrance, 6-methylcoumarin. By photomaximization testing 6-methylcoumarin was found to be a potent photocontact allergen.
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Kaidbey et al. (1978) studied this question.
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