Herpes Simplex (HSV-1 & HSV-2): Symptoms, Types & Information

There is no such thing as herpes A B. Herpes simplex is a common viral infection that can cause sores or blisters on the skin, mouth, or genitals. It is caused by the herpes simplex virus (HSV). There are two types of HSV: HSV-1 and HSV-2. HSV-1 usually causes oral herpes, also called fever blisters, while HSV-2 usually causes genital herpes.