Canker sore - Symptoms and causes - Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/canker-sore/symptoms-causes/syc-20370615
Apr 03, 2018 · Canker sore — Learn about the causes, treatment and prevention of this painful mouth sore. COVID-19: Advice, updates and vaccine options. ... Canker sore. Canker sores occur singly or in clusters on the inside surfaces of your cheeks or lips, on or under your tongue, at the base of your gums, or on your soft palate. ...
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