Canker sores: Canker sores are often secondary to an infection somewhere else in your body, or to stress, or to eating too much spicy or acidic food. It is not herpes, if someone has told you that, but it could be due to another virus, especially if you are also feeling ill. You should let your doctor examine you, to make sure you don't have a significant underlying problem.
Answered 12/9/2013
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See a doctor: Hard to determine without a clinical exam. Start with your dentist or physician. They may refer you to an ear, nose and throat doctor as well.
Answered 8/25/2013
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