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Red meat
Sink your teeth into a big, juicy burger and the unexpected happens: you erupt in hives. Bites from the Lone Star tick can cause this perplexing allergic reaction. "Their bite can sensitize you to a protein that's found in red meat," says Ogden. While it's typically found in the Southeastern and Eastern U.S., these ticks have recently expanded into the Northeast and are causing an increase in the number of cases, according to the Centers for Disease Control and Prevention. "This needs to be on every allergist's radar especially if you've had a rash for a few days and don't know what caused it," she says.