Canker sore/cold sore??

Okay so whats the difference between these two? I know there isno cure for cold sores & that they are a strain of herpes but is ther a cure for canker sores? Are they a herpes virus strain too? If you get a canker sore once will you always get them? Just curious as I saw a canker sore question on here & it dawned... show more Okay so whats the difference between these two? I know there isno cure for cold sores & that they are a strain of herpes but is ther a cure for canker sores? Are they a herpes virus strain too? If you get a canker sore once will you always get them? Just curious as I saw a canker sore question on here & it dawned on me I really have no idea what they are. Thanks
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