What disease is also commonly known as fever blisters?

The term "fever blisters" is commonly associated with cold sores, which are caused by the herpes simplex virus. While herpes simplex encompasses the virus responsible for these blisters, the specific manifestation seen on the lips or around the mouth is what people refer to when they mention fever blisters. Such blisters typically arise when the virus reactivates, often triggered by stress, illness, or sunlight.

Herpes simplex virus has two types: HSV-1 primarily causes oral infections (including cold sores), while HSV-2 more commonly results in genital infections. Therefore, the connection between the term "fever blisters" and herpes simplex emphasizes the viral origin of this condition, making it the most accurate answer to the question. This underscores the importance of understanding the terminology surrounding viral infections in esthetic practices, especially as it pertains to skin care and client interactions.