A female asked:
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What causes fever blisters and what can u do to prevent them my ex husband never gets them what can I do to prevent them

1 doctor answer
Dr. Joy Jackson
18 years experience in Family Medicine
Fever : Fever blisters also known as cold sores are caused by the herpes virus (most commonly herpes simplex type 1). They are spread by direct contact with the lesion when present. For example kissing when a lesion is present, having oral sex while the lesion is present, etc. Also sharing drinking glasses, soda cans, cigarettes, lipstick or chap stick can spread the virus. If all of he above can be avoided then the spread should be prevented. All the best.
Answered on Oct 3, 2016

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