A few things: The biggest danger is a phenomenon called angiodema.Angioedema is a rapid swelling of the lips caused by a reaction to medication and can a true emergency. The most common medications causing this are ace inhibitors- a class of blood pressure medicines whose generic name always ends in "-opril." if your lips are swelling and on one of these meds call or see your doctor immediately, even if old med.
Answered 12/2/2016
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Angioedema: Angioedema is a classic cause of swollen lips, especially if it is just one part or just a certain side of the lip. Could also be due to a cold sore or canker sore or even an infection with bacteria if it is all red, puffy, swollen and warm to the touch.
Answered 7/9/2018
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