Pimple or cold sore?: Pimples are common on the lip margin (the vermillion border) and around the mouth. So are cold sores. Sometimes it can be difficult to tell just by looking at one point in time. If there is pain, that might suggest cold sore, and if it does go on to blister, then cold sore it is. However, if it does not go away within a week or two, i would recommend evaluation by a dermatologist.
Answered 4/29/2019
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2 doctors weighed in across 2 answers
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