Final answer:
Cold sores on the lips are caused by the Herpes simplex virus type 1 (HSV-1), which is highly contagious and can remain dormant in the body for long periods before causing recurrent symptoms.
Step-by-step explanation:
The Herpes simplex virus type 1 (HSV-1) causes cold sores, also known as acute herpes labialis, on the lips. HSV-1 is a highly contagious virus that can be transmitted through direct oral contact and can remain dormant within the body for long periods. When it reactivates, it leads to the recurrence of symptoms such as blisters around the lip area that can break open and crust over. Although there is no cure, treatments like antiviral medications can help manage outbreaks. Cold sores are the result of an HSV-1 infection, which typically manifests as blisters or sores on or around the lips. HSV-1 is highly contagious and can be spread through direct contact, even when a person does not have symptoms. It is important to note that HSV-1 is different from the influenza virus, human papillomavirus, and varicella-zoster virus.