Are canker sores contagious to lips?

Also known as aphthous ulcers, canker sores are small sores that can occur inside the mouth, cheeks, lips, throat, or sometimes on the tongue. But don't confuse canker sores with cold sores or fever blisters, which are sores that are caused by the herpes simplex virus and are found outside the mouth around the lips, on the cheeks or chin, or inside the nostrils. Whereas cold sores are contagious, canker sores are not contagious — so kissing cannot spread them. Although canker sores aren't contagious, the tendency to have outbreaks of canker sores can run in a family. If you're prone to canker sores, your child has a 90% chance of getting them as well.