Baby canker sore???

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I swear that's what it is. Its inside his bottom lip right where it meets the gum. I cant get a good look or a pic but it doesnt look chunky like thrush. I didnt even know babies could get them!! Now I'm all worried and hes upset when he eats cuz it hurts and the dr is out til Monday:( I get cancer sores a lot and they suck. And no, it's not the same as a cold sore.