http://articles.mercola.com/sites/articles/archive/2000/06/24/cold-sores.aspxResearchers in Israel have found a connection between the measles virus and common painful mouth ulcers, known as recurrent aphthous ulceration (RAU). RAU is a common condition, with some studies showing that 20% of the world population has suffered RAUenCommunityServer 2008.5 SP1 (Build: 31106.3070)http://articles.mercola.com/sites/articles/archive/2000/06/24/cold-sores.aspx#200783Wed, 17 Jun 2009 23:28:11 GMT24451277-a5aa-4add-96dc-64081bfd86fa:200783tiger366<p>Cold sores, not the herpes blisters, cold sores can occur by mechanical cause, sucking unconsciencely your inner lip against teeth in a stressy moment.</p> <p>Toothbrushes itself can be filthy.</p> <img src="http://articles.mercola.com/aggbug.aspx?PostID=200783" width="1" height="1">