Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. A small blister occurring on the lips and face and caused by herpes simplex. Also called fever blister, herpes labialis.
Century Dictionary and Cyclopedia
- n. A herpetic eruption about the mouth and nostrils, often accompanying a cold in the head.
Wiktionary
GNU Webster's 1913
- n. (Med.) a vesicular eruption appearing about the mouth as the result of a cold, or in the course of any disease attended with fever.
WordNet 3.0
- n. caused by herpes simplex virus type 1 (HSV-1)
Examples
“ViraMedx Releev 1-Day Cold Sore Treatment is the only cold sore medication—natural or otherwise—shown in published studies to give substantial, consistent healing in twenty-four hours against drug-resistant outbreaks.”
Lists
These user-created lists contain the word ‘cold sore’.
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Cold
Cold, cold, cold storage, cold shoulder, cold sore, cold front, cold water, cold turkey, cold fusion, cold sweat, cold shower, cold wave and 10 more...
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Things from my memory
nigger baby, mexican jumping bean, puddle jumper, mood ring, pet rock, cat scratch fever, taxman, hippie, vaseline, argyrol, mercurchrome, methiolade and 655 more...
Tweets
Looking for tweets for cold sore.

treeseed Herpes simplex type 1 is usually the cause of common nonsexually transmitted cold sores.
_Wikipedia
Herpes is a disease of the nerve endings and the frequent blowing or whiping of the nose during a cold can irritate the skin around the mouth and nose which can irritate nerve endings already afflicted with the dormant virus and cause it to become active. Sunburns can have the same effect.(My personal observations.)
While both oral and genital herpes are characteristically "nuisance infections" that are not life-threatening, cold sores (on the face) can cause rare severe or fatal disease if they travel to the eyes or brain.
_Wikipedia
(I say that it is for this reason that one should be careful that one's doctor does not misdiagnose a cold sore as impetigo as happened to my ex-husband.0
Feb 5, 2008