Homecoming queen dream comes true for Riley McCoy, the girl who can’t go out in the sun

> Riley was born with a rare genetic disorder called xeroderma pigmentosum (XP). Any exposure of her skin to the ultraviolet rays of the sun – even a sliver of light through an open door or a cracked window – could result in a blistering burn, potential malignant cancer, internal organ damage and, eventually, death. Her DNA does not contain the antibody to repair the damage caused by cyclobutane dimers and 6-4 photoproducts that invade skin inside UV rays, said Debby Tamura, a research nurse at the National Institutes of Health. I burn easy and joke that the sun is always trying to kill me, but in her case it literally is.