Cold sores are also known as fever blisters. Some people frequently get cold sores while others may not get them throughout their lifetime. When they do come out, they feel very itchy and painful. Cold sores are, however, a treatable condition.
There are mainly two strains of Herpes virus, HSV1, and HSV2. HSV1 affects the areas in and around the mouth and lips. Although HSV1 is the most prevalent cause of oral herpes, 20 % of the cases result from HSV2. These viruses are mainly transmitted during anal, oral and vaginal sex.