Cold sores ARE oral herpes. Most commonly, whenever someone is a child they can get herpes from a family member who gets cold sores kissing them. A LOT of people don’t know that cold sores/fever blisters are herpes and can be spread to the genitals. I’ll see posts on tumblr where people will say things like “got another cold sore, don’t worry it’s not herpes!” or “don’t worry guys cold sores aren’t THAT kind of herpes!” and all I can imagine is how awful it’s going to be when they give their partner genital herpes because they didn’t know that cold sores are herpes. That’s why using protection during oral sex is so important and the fact that many people don’t use protection during oral sex is so devastating!
make sure it is a cold sore, they are commonly confused with canker sores, which are not herpes.