The Herpes Simplex Virus does not cause canker sores, the herpes virus causes cold sores. They are two different types of ulcers.
Its very important that you can differentiate between the two. Cold sores are usually on the outside of the mouth, and usually a sure sign you have the herpes simplex virus, and are very contagious.
Canker sores are usually located in the soft tissue on the inside of the mouth, and are not contagious.
Hippie Ripper you seem to be describing cold sores, and I would strongly suggest anyone who has cold sores, keep contact with other people very limited. It is very easy to spread the Herpes Simplex Virus, and I certaintly would not want to be grappling with a virus infected cold sore.
Many people pass off cold sores as canker sores because they dont want to face the fact they have a STD, but it is very important that you can correctly diagnose between the two.