Cold sores are painful blisters that form around or on the lips and inside the mouth. This is caused by an infection with a virus called herpes simplex virus. Symptoms of cold sores are: painful blisters on the lips, mouth, nose, or throat; throat and mouth pain; swelling in the neck; and body aches. Cold sores can be treated with antiviral medicines that reduce symptoms and shorten the amount of time symptoms last, but these medications work the best if started right away.
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