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A 21-year-old female asked:

Didn't drink or eat after anybody. woke up fine brushed teeth noticed my upper lip burning look n i c a blister lik sore what is it n y did it just sho?

2 doctor answers2 doctors weighed in
Dr. Jeffrey Bassman
Dentistry 45 years experience
Vague: Hard to say. Reaction to the toothpaste? Bit lip in your sleep?
Dr. Paul Grin
Pain Management 36 years experience
Canker sore: Canker sores are the most common oral lesions. Individual ulcers typically last 1-2 weeks. The condition is idiopathic (cause is not known) recurrent aphthous ulcers is usually self-limiting.

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Last updated May 22, 2014

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