A member asked:

What type of herpes simplex virus causes cold sores?

7 doctors weighed in across 2 answers

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 10/25/2017

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Hsv-1. Usually: Fever blisters are usually caused by hsv-1, but they can be caused by hsv-2.

Answered 1/23/2019

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