At first, Deborah Kogan of New York says, she thought it would pass. Her 4-year-old son's fever had been on the rise for hours, and he was looking puffy. Kogan took Leo to the pediatrician, who thought it might be strep throat. It wasn't.
A few days later, Leo "woke up, and he looked as if he was one of the characters in The Nutty Professor. His face ballooned about twice its normal size." She posted a photo of Leo on Facebook. That's when the crowdsourced diagnosis took shape.