Use a Q-Tip or cotton ball to dap Listerine (Any mouth wash works. I have just found that Listerine works best for me.) on the affected area a few times a day and let air dry. You can do this at any stage, including the tingly-still-under-the-skin, or almost healed. I use to get horrible cold sores that covered at least a quarter of my mouth at a time for weeks. Now they stay small(usually smaller than a dime) and are gone in just a few days.
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