An inflamed blister in or near the mouth, caused by infection with the herpes simplex virus.
- If it had been herpes simplex (the cold sore virus), the blisters would have been uniform in size.
- They think that it might be possible to use a version of the cold sore virus herpes simplex to treat a particularly nasty form of brain cancer called glioma.
- Herpes simplex infections commonly cause either cold sores around the mouth or blisters in the genital area (also known as genital herpes).
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