What are the chances of catching herpes-1 by lip kissing or french kissing if no cold sores are seen? I guess they could be on the inside of the lip and not seen? About half the population is infected, meaning there is a 50:50 chance you already have HSV-1 yourself–in which case, your chance of getting a new HSV-1 infection is virtually zero, even if exposed. You dont have to have an ob of hsv on your mouth to pass it to someone that you kiss, the virus may be shedding cells and thus being passed to whomever you kiss on. That means there are actually a wide variety of ways these diseases can spread. A person can get the disease through the skin, but it is more likely to spread if it can get inside the body through direct contact.