The American Social Health Association estimates 50 percent to 80 percent of people are infected with the herpes simplex 1 virus (HSV-1) that causes cold sores. The virus resides in the ganglion at the top of the spine, where it lays dormant until reactivated. At least 25 percent of people who've had cold sores eventually get another.
About Cold Sores
The National Institutes of Health notes that once infected with HSV-1, the first symptoms of a cold sore are usually noted between one and two weeks. Cold sores resolved in seven to 10 days and usually don't require medical treatment, the Mayo Clinic says.
If You Don't Have Oral HSV-1
Refrain from kissing or making facial contact with those with cold sores. HSV-1 can also be spread through razors, towels, lip balm and eating utensils.
Cold Sore Triggers
Subsequent cold sores can reoccur without provocation. But a repeat performance can be triggered by menstruation, stress, the fever that accompanies illness or sun exposure.
Preventive Measures
The Mayo Clinic advises getting plenty of sleep, avoiding getting the cold or flu, and staying in the sun for brief durations. Sun block should be applied to the lips and face before prolonged sun exposure.
See a Doctor
The Mayo Clinic advises medical consultation if blisters erupt near the eyes or if cold sores are frequent, severe or heal slowly.
