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There are many types and causes of mouth sores. Mouth sores may be caused by an infection, a bodywide (systemic) disease, a physical or chemical irritant, or an allergic reaction (see Table: Some Causes of Mouth Sores). Often the cause is unknown.
Cold sores are also referred to as fever blisters and they cause pain and discomfort on the mouth area. These sores are actually caused by the herpes viruses and are most common cause of sores around the mouth. Know how you can prevent cold sores effectively.