Canker sores (mouth ulcers)

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An overview of the signs, symptoms, treatments and medical options for canker sores.

Key points

  • Canker sores are different than cold sores or fever blisters.
  • Canker sores do not appear to spread from person to person.
  • Signs of canker sores include painful, red spots across the tongue or on the mouth lining.
  • You can help your child by not feeding soft drinks or spicy, acidic or salty foods.
Last updated: October 30th 2019