Herpes simplex virus, in general, refers to the herpes simplex virus. Herpes simplex virus can be divided into type 1 and type 2. Type 1 herpes simplex virus mostly causes herpes simplex around the mouth, which is often referred to as a mouth sore. This sore is accompanied by pain and is more likely to recur when a person’s immune system is low. However, in general, perioral herpes simplex caused by the herpes simplex virus is a self-limiting disease that can be cured after a period of time, even without treatment. Herpes simplex virus type 2 is also associated with painful herpes, but is more often found near the external genitalia, hence the name genital herpes, which can be transmitted through sexual means. In addition, herpes simplex virus infection in pregnant women may also cause abnormalities in the development of the fetus, so it is also important to pay attention to the possibility of the child being infected with the virus through the birth canal during delivery.