Cold sores are caused by the herpes simplex virus, usually herpes simplex virus type 1 (HSV-1). There is little to no evidence that specific foods trigger outbreaks. Common cold sore triggers include ...
Canker sores form inside the mouth on soft tissues like gums, cheeks, or under the tongue, and are not contagious. Cold sores usually appear on or around the lips and are caused by herpes simplex ...
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