Cold Sore: Cold sores are caused by certain strains of the herpes simplex virus (hsv). You get the first episode of herpes infection from another person who has an active lesion. Shared eating utensils, razors and towels, as well as kissing, may spread hsv-1. Oral sex can spread hsv-1 to the genitals and hsv-2 to the lips. They usually go away within two weeks. If they haven't see a dermatologist.
Answered 10/28/2013
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