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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.
If the sore has already erupted and is beginning to scab, use an over-the-counter medication like Abreva to help ease symptoms and reduce redness. Cold sores typically last 7 to 10 days, so it all depends on how early you catch and treat it, says Dr. Welsh. Cold sores are caused by the herpes simplex 1 virus and don't pop up unless something triggers them -- usually stress or overexposure to the sun.