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An ulcer is a break in the skin due to loss or degeneration of the surface tissue. Mouth ulcer refers to an ulcer that appears on the mucous membrane of the oral cavity. There are various types of mouth ulcers such as minor ulcers (diameter of around 2-8mm), major ulcers (bigger and deeper than minor ulcers), and herpetiform ulcers (a cluster of dozens of smaller sores). Some of the common causes of mouth ulcers are stress or tissue injury, excessive consumption of citric food such as lemons, oranges, apples, and others, impaired immune problems, and nutritional problems.
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