Probably sun: The most likely explanation is sun/UV light exposure to normal small salivary glands in the lips causing a small amount of inflammation. Because it is painless It is much less likely to be a cold sore due to the herpes virus. I believe it should resolve on its own. Keep your lips moisturized with use of an OTC lip balm. If it persists or more develop, consider consultation with a Dermatologist.
Answered 9/14/2015
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
9 doctors weighed in across 5 answers
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