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Cold sores are tiny blisters that form around the mouth affect more than 150 million people across the nation.
Also referred to as 'fever blisters,' cold sores typically develop on and around the lips and mouth as tiny, fluid-filled blisters or lesions.
Over many days or weeks, they can break open and develop into a crust before healing. Cold sores are primarily caused by the HSV-1 variation of the herpes virus, which affects roughly 67 percent of people worldwide under 50. Don’t sweat it.