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To repair and sustain healthy skin.A cold sore or herpes simplex labialis is usually caused by the virus type herpes simplex virus 1 (HSV). Most people are infected by this virus to the preschool through direct contact (kissing, fondling), or by the hands or utensils. Once one is infected, the virus remains in the body for life. Under the influence of the fever, the light of the sun, extreme temperatures, menstruation, stress or fatigue, the virus present in the body can be activated, and you get a cold sore. Cold sores usually appear on the edge of the lips, but can also appear in the mouth, on the chin, the nose, the cheeks, the forehead and even on other parts of the body. In general, the epidemic is heralded by itching or tingling, or a burning sensation around the mouth.