There are aphthous ulcers (canker sores) on the right of the image at the corner of the mouth, just below the tongue, and also a shallow ulcer on the lower lip on the left. This image displays a shallow ulcer inside the mouth, typical of an aphthous ulcer (canker sore). This image displays a shallow aphthous ulcer (canker sore). This image displays multiple aphthae (canker sores), lesions with a white center and red surround. This image displays a larger-than-usual aphtha (canker sore), with the typical white erosion. This image displays a large, healing aphtha (canker sore) on the lower lip.
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Canker Sore (Aphthous Ulcer):
A parent's guide to condition and treatment information

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Picture of Canker Sore (Aphthous Ulcer): There are aphthous ulcers (canker sores) on the right of the image at the corner of the mouth, just below the tongue, and also a shallow ulcer on the lower lip on the left. Divider line
There are aphthous ulcers (canker sores) on the right of the image at the corner of the mouth, just below the tongue, and also a shallow ulcer on the lower lip on the left.
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Signs and Symptoms
The most common locations of canker sores are inside the mouth or lips or on the tongue. The genitals may also be affected. Ulcers can have a white, gray, or yellow base.
  • Minor aphthae are single or multiple lesions, 1.0 cm or less in diameter.
  • Major aphthae are deep ulcers greater than 2.0 cm in diameter.
  • Herpetiform aphthae appear as multiple ulcerations.
Last Modified: 29 Jan 2008

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