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Oral Health

Picture of Cold Sore and Canker Sore

Picture of Cold Sore and Canker Sore

Cold sores and canker sores aren't the same. Cold sores usually appear on the lip; canker sores affect the inside of the mouth. Canker sores don't involve the herpes virus and aren't contagious. Their cause is unknown. Cold sores generally herald their arrival with a warning period of red, irritated skin. Blisters form, rupture, then crust over before healing.

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Reviewed by Laura J. Martin, MD on August 03, 2010

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Text: "Dental Health and Canker Sores", WebMD Medical Reference