A number of things can trigger re-occuring break outs of herpes.
The most common are stress and lowered immune systems.
If you get run down by stress or have an illness that lowers your immune system then another break out could occur.
Herpes zoster causes shingles.
The virus that causes blisters around the mouth is the herpes simplex virus (HSV), primarily HSV-1. This virus is responsible for oral herpes, which often manifests as cold sores or fever blisters. These blisters can be painful and may recur periodically, especially during times of stress or illness. While HSV-2 is typically associated with genital herpes, both types can occasionally affect the oral region.
An infection. Usually herpes simplex, (herpes 1) a virus. See herpes
Te herpes virus causes cold sores.
Herpes.
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A cold sore is a herpes infection of the lip. Herpes simplex type I usually causes cold sores while type II usually causes genital herpes. Occasionally it can be the other way around.
Herpes virus
Herpes simplex virus type 1 is more commonly diagnosed in oral herpes, but both type 1 and type 2 can infect the mouth, genitals, or other body parts. Type 1 is less likely to recur than type 2.
A herpes infection that has spread to the brain causes headache, fever, confusion and sometimes seizures.
The herpes virus causes cold sores.
This is herpes infection. It is caused by a herpes simplex virus (HSV). Oral herpes causes cold sores around the mouth or face.