11/06/2008 05:12 am ET Updated Nov 17, 2011

10 Bizarre Allergic Reactions Revealed

When you use something new on your body, it might take a week or two to elicit the allergic reaction, explained Rosenthal, vice chairman of academic programs at the department of family and community medicine at Thomas Jefferson University. "Don't think that because you've been using something a long time that it can't be that."

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