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Do you have a cold sore today? Would you know if you did? The cold sore, sometimes referred to as a fever blister, is a small but painful blister that occurs on the face — usually in the region of the mouth, lips, and nose.

When a cold sore first appears, it is a small pimple-like skin infection. It gradually develops into bigger blister-like sore, filled with fluid and very painful.

When the blister ruptures, the appearance of the cold sore becomes more yellow and dry — like a crusted-over Read more . . .