Canker Sores vs. Cold Sores (Fever Blisters)
Canker sores are not the same as cold sores (fever blisters). Some of the differences between canker sores and cold sores are:
- Cold sores break out on the lips. Canker sores break out inside the mouth.
- Canker sores are not caused by the herpes virus.
- Canker sores are not contagious.
- A cold sore starts as a blister and then ruptures.