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 ...
Objective: To investigate possible photoallergic reactions in patients ... true delayed type IV hypersensitivity (allergic contact dermatitis and photoallergy) to sunscreens is more infrequent ...
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