They commonly pop up on the inside of the lip or cheeks. Canker sores have a litany of causes including trauma, hormonal changes, stress, and food allergies, explains Hannah Kopelman, D.O., a ...
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Got a Pimple on Your Lip? Here's How to Get Rid of ItLearn how to identify a cold sore vs. a pimple, canker sore, or chapped lips, and how to treat the problem fast.
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