Which form of herpes generally causes sores or fever blisters from the waist up?

Herpes Type 1 (HSV-1) is primarily known for causing oral herpes, which can manifest as sores or fever blisters on or around the lips and face. This form of the virus is commonly transmitted through oral contact and is responsible for the familiar cold sores that many people experience. While HSV-2 mainly causes genital herpes, HSV-1's association with oral infections makes it the correct answer when considering lesions appearing from the waist up.

Herpes Zoster, also known as shingles, is caused by the reactivation of the varicella-zoster virus, which is different from the herpes simplex viruses and typically results in a painful rash rather than fever blisters or cold sores. The term "Herpes Simplex Virus" could refer to both HSV-1 and HSV-2 collectively, but it is not specific enough to pinpoint the type that primarily affects the upper body. Therefore, the specificity of HSV-1 makes it the most appropriate answer regarding sores or fever blisters occurring from the waist up.