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Is a fever blister on the mouth, herpes simplex 1?

Todd A. Welch, DMD
Periodontics
If you suffer from cold sores, you are not alone. However, cold sores are not related to the common cold. They are caused by a virus called herpes simplex virus type 1, or HSV-1. As many as 45 of every 100 Americans have had cold sores related to the HSV-1 virus.

Yes, a fever blister on the mouth is herpes simplex 1.  It can also be triggered by sun exposure, so make sure to wear sunscreen on your lips.  An over the counter supplement, lysine, can help prevent outbreaks, and several prescription medications, such as Valtrex and Zovirax can make a tremendous difference in reducing healing time. 

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