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Types of Mouth Ulcers

They are also classified based upon the size and intensity of damage, into the following three types of mouth ulcers–

Ulcer type 1 imageMinor ulcers: These ulcers appear as single and small. They occur on the floor of the mouth, tongue, inside of the cheek, and pharynx; are < 8 mm (typically 2 to 3 mm) in size


Ulcer type 2 imageMajor ulcers: These ulcers are bigger and deeper than minor ulcers; and can be more than 1cm in size. These ulcers take about 15 to 30 days to heal and may leave a scar after healing.


Herpetiform ulcers: These ulcers start out as single pinpoint sized ulcers which then fuse to form one large cluster inside your mouth. The cause is usually an underlying viral or bacterial infection. This kind of mouth ulcers are associated with various medical conditions such as:

  • Food allergies
  • Oral infections
  • HIV infection
  • Some cases of diabetes mellitus
  • Behcet’s disease
  • Hand, Foot, and Mouth disease
  • Oral lichen planus
  • Recurrent apthous stomatitis
  • Gastro-esophageal reflux disease (GERD)