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To the Editor.—
Identical 25-year-old twin sisters from Michigan presented themselves in my office with their fourth attack of polymorphous light eruption during a period of four years. They had a profuse, pink papular rash confined to sun-exposed surfaces, which began on the third day of a vacation in Waikiki. Previous attacks had occurred in Nassau, Florida, and Acapulco; this was the first attack they had experienced when both were in the same resort, however.There was no history of atopy, other skin problems, or recent medication. Time did not permit phototesting.