Cold sores, or fever blisters, are precisely herpes simplex virus type 1 (HSV-1) that appear as fluid-filled blisters around the lips that can also develop on the chin, cheeks or inside the nostrils.

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Cold sores, sometimes called fever blisters, are small ... It's common for them to form around the lips or the chin, but they can also pop up on your cheeks, nose, forehead, neck, back, upper ...