As far as what they are, I can’t add anything other commenters haven’t already mentioned.
One treatment that helps me a lot is to begin applying Abreva (docosanol) as soon as I notice a sore is forming. It’s technically a cold sore medication, and as others have mentioned cold sores and canker sores are different. I’m not sure why it works, but for me it really does. It reduces both the intensity and duration of my canker sores. Only downside is that Abreva is expensive. But the generic pharmacy brands work just as well and will save you a bit.
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