A 30-year-old member asked:
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What type of herpes simplex virus causes cold sores?

1 doctor answer
Dr. Robert Kwok
32 years experience in Pediatrics
Type 1 more common: Cold sores on or near the lips are due to recurrence of herpes type 1 or 2. Herpes viruses, after the initial infection, live in a person's nerves and travel down the nerves to the surface to form blisters that break open, spreading more virus. Type 1 is more common on the lips, and type 2 more common on the genitals. With people engaging in oral sex, either type can be in one or both locations.
Answered on Oct 25, 2017
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