Fever blisters are caused by an initial infection with the herpes simplex virus (HSV-1). The main triggers of a fever blister outbreak can be due to external and internal causes.
|Internal factors||External factors|
|Illness||Ultraviolet radiation (sunshine, tanning booths)|
|Upset stomach or GI disturbance||Excitement|
|Minor infections||Emotional stress|
|Any disease that increases metabolism (e.g. diabetes, hyperthyroidism)||Drying of the lips|
|Presence of a second virus (e.g., common cold, flu)||Allergic reactions, including reactions to food|
|Fatigue||Any physical injury|
|Factors that depress the immune system||Dental treatment|
Herpatch helps to treat fever blisters throughout their entire cycle. Its effect goes even so far that the application of a Herpatch can help to prevent the occurrence of fever blisters, when the first tingling is felt on the lips!