You have a little something on your lip. No, it's not food; it's a cold sore. Cold sores, also called fever blisters, are small groups of blisters around the mouth. The skin turns red and the sore may even break open, seep out a clear liquid and then scab over. These nasty little buggers take anywhere from three days to two weeks to completely heal.
To shorten healing time, dab a little lemon juice on that irritating cold sore. The juice acts as an astringent and promotes healing. The acid will burn a little when applied to the sore, but a few seconds of discomfort is worth a blemish-free mouth.