Localized collections of generally red or purple blisters that are filled with clear fluid. These appear at the corners of the mouth or around the lips, rising then collapsing within a few days. A yellow crust usually develops over the sores, which will heal without scarring in 1-2 weeks. Cold sores may occasionally appear inside the mouth over a bony surface, such as the roof of the mouth or the gums. Cold sores often recur about once a year and are generally due to the Herpes Type 1 (HSV1) virus. NOTE: Cold sores are not the same as canker sores (mouth ulcers), which appear only on the soft tissue inside the mouth (inside lips and cheeks), burst after 24 hours, and become covered in a yellowish or gray coating.
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