Abstract
During the past two decades an increasing number of reports have been made concerning photodermatitis which is produced by topical application on the skin of certain plant substances and subsequent exposure of the skin to sunlight. The supposed offending agent was either an aromatic oil or some part of the oleoresinous content of the plant which came in contact with the skin. Perhaps the earliest and the commonest example is now referred to as Berlock dermatitis, which was first reported by Freund1 in 1916. This followed the application of certain toilet waters and perfumes and subsequent exposure to sunlight. It is alleged to be due in part to bergamot oil and occasionally to certain other essential oils also present in the preparations. Ten years later Oppenheim2 called attention to an eruption which occurred in persons taking sun baths who were at the same time in contact with certain

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