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Canker Sore
A canker sore is a mouth ulcer or sore that is open and painful. The most common sign is a burning or tingling in an area of your mouth that the red sore appears.
Source: healthline.com

en.wikipedia.org/wiki/Aphthous_stomatitis

Aphthous stomatitis is a common condition characterized by the repeated formation of benign and non-contagious mouth ulcers (aphthae) in otherwise healthy individuals. The informal term canker sores is also used, mainly in North America, ... The term is from Greek: αφθα aphtha meaning "mouth ulcer". File: Aphthous ...

www.medicinenet.com/canker_sores/article.htm

Canker sores are painful sores inside the mouth. They may occur on the tongue, the ...

www.mayoclinic.org/diseases-conditions/canker-sore/basics/causes/con-20021262

The precise cause of canker sores remains unclear, though researchers suspect that a combination of factors contributes to outbreaks, even in the same person.

www.webmd.com/oral-health/guide/canker-sores

Jun 10, 2016 ... Canker sores appear in the mouth and can be painful. Learn from the experts at WebMD about causes, symptoms, and treatment.

www.webmd.com/oral-health/tc/canker-sores-topic-overview

What is a canker sore? A canker sore is a shallow sore shaped like a crater (ulcer ) on your tongue or on the inside of your lip or cheek. Canker sores have a red ...

www.colgate.com/en/us/oc/oral-health/conditions/mouth-sores-and-infections/article/canker-sores-cold-sores-and-more

Canker Sores (Aphthous Stomatitis or Recurrent Mouth Ulcers) ... /oral-health/ conditions/mouth-sores-and-infections/article/canker-sores-cold-sores-and-more.

www.colgate.com/en/us/oc/oral-health/conditions/mouth-sores-and-infections/article/what-are-canker-and-mouth-sores

Although there are numerous types of mouth sores and disorders, among the most common are canker sores, cold sores, leukoplakia and candidiasis (thrush).

www.healthline.com/health/canker-sores

www.medicalnewstoday.com/articles/303311.php

Canker sores cause local pain and can be easily irritated. In simple cases, these are the only symptoms, although the pain may cause ...