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To the Editor.—
Local phototoxicity from the accidental application of psoralen solution from Oxsoralen Ultra capsules has been observed in four patients. In two instances, a capsule ruptured in the bottle and the liquid methoxsalen coated the other capsules, making them sticky to the touch. The two patients, both women, wiped their fingers across their abdominal skin at some time before treatment with ultraviolet (UV) irradiation. The result was intense erythema in a rather bizarre pattern of streaks and irregular macules that appeared two days after treatment and was followed by dark, persistent pigmentation. These patients were both skin type 2 and had received 63 and 37 treatments, respectively, for a total UVA exposure dose of 761 and 290 J/cm2. In a third instance, a young man placed his capsules in the pocket of his shorts, a capsule ruptured, and the liquid leaked onto the skin of his thigh.
Morison WL. Topical Phototoxicity From Oral Methoxsalen Capsules. Arch Dermatol. 1989;125(3):433. doi:10.1001/archderm.1989.01670150123024