Image of Herpes Simplex of Lower LipMost of the populations anywhere in the world are exposed to the viruses at some point of time that cause cold sores in the mouth. Those can be herpes simplex virus type 1, or herpes simplex virus type 2.Cold sores might appear just once in a person's life, or recur off and on. They mostly affect the superficial nerves.
The triggering factors can be;
- Stress and strain,
- A cold, fever, or the flu.
- Hormonal changes, such as during menstruation or pregnancy.
- Trauma such as shaving.
