Why do our lips get chapped?

We’ve all suffered with chapped lips in the winter: itchy, flaking, sometimes even bleeding. Yikes! One of our listeners wanted to know how this happens, so we asked dermatologist Roxana Daneshjou to explain.  Got a Moment of Um question for us? Send it to us at BrainsOn.org/contact, and we’ll ask around for the answer.

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Moment of Um is your daily answer to those questions that pop up out of nowhere and make you go… ummmmmmm. Brought to you by your friends at Brains On at APM Studios.