There are two main types of herpes infections:
- Genital herpes – This sexually transmitted infection (STI) is caused by the herpes simplex viruses type 1 (HSV-1) and type 2 (HSV-2).
- Oral herpes – This is usually caused by HSV-1, which can cause infections of the mouth and lips (cold sores or fever blisters). Most people infected with oral herpes got it during young childhood from nonsexual contact, such as through saliva.