Cold sores are caused by the herpes simplex virus (HSV). There are two types of herpes simplex virus: HSV-1 and HSV-2. Both virus types can cause sores around the mouth (herpes labialis) and on the genitals (genital herpes). A cold sore is usually caused by HSV-1. HSV-2 is the main cause of genital herpes. The herpes simplex virus usually enters the body through a break in the skin around or inside the mouth.

The virus is usually spread when a person touches a cold sore or touches infected fluid—such as from sharing eating utensils, sharing razors, kissing an infected person, or touching that person’s saliva. A parent who has a cold sore often spreads the infection to their child in this way. Cold sores can also be spread to other areas of the body/face.

Impetigo and a cold sore are often confused. A cold sore is caused by the herpes simplex virus. Impetigo to is a highly contagious skin infection and it is caused by bacteria. Impetigo, which is one of the most common skin infections among kids, usually produces blisters or sores on the face, neck, hands, and nappy area. This contagious superficial skin infection is generally caused by bacteria. SoreFix is not suited for the treatment of Impetigo.