Which of the following is a common symptom of herpes simplex virus?

The presence of cold sores is a well-recognized symptom of the herpes simplex virus (HSV). This condition often manifests as painful blisters or sores, typically occurring around the lips and mouth, although they can also appear in other areas. Cold sores are caused primarily by HSV-1, which is the most common strain associated with oral herpes.

When considering the other symptoms, while a rash and itching may accompany herpes or could be associated with other dermatological conditions, they are not specific to the herpes simplex virus. Cold sores are a distinctive and characteristic symptom of HSV, making this option the most accurate choice in identifying common symptoms related to this infection.