Originally Posted by polish_aristocrat

There are two types of HSV, HSV-1 and HSV-2. In most cases, HSV-1 causes ulcerative lesions of the oral mucosa/lips that are commonly referred to as cold sores or fever blisters. HSV-2, on the other hand, generally causes genital herpes. However, some genital herpes may be caused by HSV-1 virus, and some oral herpes may be caused by HSV-2. This cross infection can happen when sexual partners have oral-genital relations.