Sunlight Allergies May Affect up to 20 Percent of the World's Population

After just a few moments in the sun, Chelsey Madore knows a field of itchy red bumps will spread across her neck, chest, forearms and hands. Sometimes she gets a headache. And sometimes the rash on her hands is so severe it erupts into angry, pus-filled blisters. "I can't stay out in the sun for more than 10 minutes at a time without having a reaction," she said. "It's hard not to feel like a vampire." Madore, a makeup artist who lives in San Diego, Calif., has an allergy to the sun called...Full Story
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