Another plausible cause would be using expired lipstick/lip gloss. That happened to me once, just a pimple for a 3 days (had a party to attend as well). I knew that it could not have been a cold sore or a fever blister, for I'm practically immune to them.
Both my mother and long-time lover have them at multiple times a year. My mom gets them more so before/after a cold/fever. My boyfriend gets after being in the sun extended periods, but never after a cold/fever. So, it has left me with the impression that there is a difference.
Answered by
Saurabh
at
9:02 PM on February 06, 2008