Specifically what causes cold sores?
Cold sores are caused by the herpes simplex virus. No doubt you've heard of "herpes" before, but don't jump ahead of yourself. There are actually two types of herpes simplex virus, "type 1" and "type 2."
Type 1 herpes simplex virus.
Herpes simplex virus type 1 ("HSV1") generally only infects those body tissues that lie "above the waistline" and it is HSV1 that causes cold sores in the majority of cases.
Type 2 herpes simplex virus.
http://www.animated-teeth.com/cold_sores/t1_cold_sores.htm
Herpes simplex virus type 2 ("HSV2") usually only infects those body tissues that lie "below the waistline" and it is this virus that is also known as "genital herpes." Herpes simplex virus type 2 is not usually the virus that causes cold sores, although it can.
The herpes simplex that causes cold sores is exposed to almost everyone during childhood. It is not the same simplex as genital herpes.
I bet money that is from her baby's head hitting her in the lip. I had a fat or split lip every week from my baby wack-in his head on my lips
Britney Spears might miss a lot more 'X Factor' auditions ... because she can! Simon Cowell gave Brit damn near free reign in order to sign the pop star to that $15 million deal -- but is it backfiring? We'll tell you what peeps on the set are saying.Plus, Chris Jericho's…
