Canker sore - Symptoms and causes - Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/canker-sore/symptoms-causes/syc-20370615
webApr 3, 2018 · They form inside your mouth — on or under your tongue, inside your cheeks or lips, at the base of your gums, or on your soft palate. You might notice a tingling or burning sensation a day or two before the sores actually appear. There are several types of canker sores, including minor, major and herpetiform sores.
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