What virus is known to cause fever blisters and cold sores?

Herpes simplex virus is the pathogen responsible for the development of fever blisters and cold sores, typically manifesting on or around the lips and mouth. This virus is categorized into two types, with types 1 and 2 commonly associated with oral and genital herpes respectively. While fever blisters, or cold sores, are primarily linked to herpes simplex virus type 1, type 2 can also cause oral infections. The understanding of this virus is crucial for cosmetology professionals, as they may encounter clients with visible symptoms, necessitating adherence to sanitation and infection control protocols to prevent transmission during services.