Final answer:
Cold sores and skin infections are primarily associated with HSV-1, a type of herpes simplex virus. Varicella-zoster virus can also cause skin infections but is mainly known for chickenpox and shingles.
Step-by-step explanation:
Cold sores and skin infections are primarily associated with the herpes simplex virus (HSV), specifically with HSV-1 for cold sores. Varicella-zoster virus is related to chickenpox in children and shingles in adults, but it is not the typical cause of cold sores, although it can cause skin infections. Cold sores, also known as fever blisters, manifest around the lips and can remain dormant in the body for long periods, triggering recurrences under certain conditions such as stress or environmental factors.