Implanted Drug Improves Tolerance Of Sunlight In Rare Condition, Mount Sinai Hospital Study

A skin-darkening drug can help protect against serious pain in people with a rare inherited condition that makes them flee sunlight like movie vampires, according to tests in Europe and the U.S.

The condition, known as erythropoietic protoporphyria, causes severe burning skin pain after several minutes of direct sun exposure. The pain can last for days and sometimes causes redness and swelling. Even bright lights or sunlight coming through a window can trigger it.

Victims sometimes refer to themselves as "shadow hoppers," said Dr. Manisha Balwani, co-investigator in the U.S. trial.

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