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A Sharecare Ad Target User , Administration, answered. An outbreak of oral herpes, or cold sores, should go away on its own in about one or two weeks. Antiviral medications can help them heal faster if taken early. Talk to your doctor if your cold sores do not go away after two weeks. Helpful? 1 person found this helpful.
1 While you have a cold sore, avoid foods that contain acid, such as tomatoes and citrus fruits. These could irritate the skin and add to any pain.  Cool the sores: Place a cool, wet towel on the cold sores for about five to 10 minutes. Do this a few times daily to help reduce the redness and irritation.