What viral infection is known for causing cold sores, and is highly contagious?

Herpes simplex is the viral infection known for causing cold sores, which are small, painful blisters that typically appear around the lips or mouth. The virus is highly contagious, especially during an outbreak when the sores are visible. It spreads easily through close personal contact, such as kissing or sharing utensils, and can also be transmitted when the virus is not actively causing visible symptoms. This viral infection can remain dormant in the body and can reactivate, resulting in recurring cold sores.

Verrucas, commonly known as plantar warts, are caused by the human papillomavirus (HPV) and do not lead to cold sores. Herpes zoster, also known as shingles, is caused by the reactivation of the varicella-zoster virus and is characterized by a painful rash but not cold sores. Folliculitis is an inflammation of hair follicles often due to bacterial infection, but it does not pertain to the herpes virus or cause cold sores.