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Cold sore

Image of cold sores

Cold sores, often called fever blisters, are clustered, small, fluid-filled blisters. You may feel a tingling on your lip before a small, hard, painful spot appears (top). In a day or two, blisters form, which later break and ooze (bottom). Healing usually occurs within two weeks. Cold sores may be more severe during childhood and less obvious in adulthood.
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