A mouth ulcer is a painful sore in the mouth. It appears on the tongue, the lips, and the gums or inside the cheeks. The first sign of the sore may be a tingling, burning sensation inside the mouth. They can occur either singly or in clusters. They are usually white or yellow in color, surrounded by red halos. Usually they heal within 7 to 10 days. There are 3 types of ulcers:

• Minor ulcers

• Large ulcers

• Herpetiform ulcers (where one can have up to 100 very small painful ulcers)
  
  

• Nutritional deficiencies such as iron, vitamins, especially B12 and C

• Poor dental hygiene

• Food allergies

• Stress

• Infections particularly herpes simplex

• Biting the cheek

• Hormonal imbalance

• Bowel disease

• Skin disease
  
  

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