Final answer:
Herpes Simplex is the highly contagious viral infection that causes eruptive, blister-like clusters, typically caused by HSV-1 (oral herpes) or HSV-2 (genital herpes), and remains in the body for life with potential recurrent outbreaks.
Step-by-step explanation:
The highly contagious viral infection that causes blister-like clusters around the mouth, nose, or genital area is Herpes Simplex. This infection is caused by two types of viruses: HSV-1, typically responsible for oral herpes presenting as cold sores around the mouth, and HSV-2, which usually causes genital herpes. Cold sores appear as red, fluid-filled blisters and are highly contagious, sometimes even when sores aren't visible. Once infected, the virus remains in the body with the potential for future outbreaks, triggered by factors such as stress or illness.