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To the Editor.—
The marking of patch tests is an important part of the technique of patch testing. If the patch tests are removed at 48 hours at the dermatologist's office, the patch test sites can be marked as they are removed with any number of ink or gentian violet marking pens, and the patient is instructed to return in another 24 hours for patch test reading. In recent years, a number of dermatologists have used a fluorescent dye that can be applied at the time of patch testing and is resistant to removal by tape. However, it will wash off with profuse sweating or with showering, bathing, or swimming. The patient is advised to remove the patch tests at 48 hours and refrain from these activities. At 72 hours, the back is illuminated with a Wood light, which clearly discloses the markings.This year, that fluorescent dye has become
Wax FD, Solomon JA. Fluorescent Dye for Marking Patch Test Sites. Arch Dermatol. 1982;118(7):449. doi:10.1001/archderm.1982.01650190003002