A canker sore is an open and painful mouth ulcer appearing whitish, often with a red halo. Its cause is unknown, but they are not contagious.

References

  1. Wikipedia, the free encyclopedia (www.wikipedia.org).
  2. Medical dictionary by Farlex (www.thefreedictionary.com).

The information above should be used as a reference only. Any medical decision should not be taken before consulting a health care professional.

The masculine gender may have been more used in the article, but without prejudice, to make reading easier.

Category dental problems