What causes fever blisters?
A fever blister located on the lips, mouth, and face is usually caused by the highly contagious herpes simplex type 1 virus. Only a small number are caused by herpes simplex type 2, the type usually associated with genital lesions.
There is no cure for a fever blister. However, there are medications that will relieve the pain and itchiness, and speed the healing of the blister.
See: Herpes labialis (oral herpes simplex)
Canker sores and fever blisters
Are fever blisters and canker sores the same thing?
No. Canker sores occur only inside the mouth and are not contagious. They sometimes occur as a result of trauma (biting the inside of the lip, burning the mouth with hot food), but may also occur without any known reason.
or cold sores are caused by herpes simplex virus type 1 and are very contagious. Fever blisters often come back in the same location.
Studies show that genital herpes simplex virus is common. In the United States, one out of five of the total adolescent and adult population are infected with herpes simplex virus. There are two types of herpes simplex viruses (HSV). HSV type 2 is the one that most commonly causes genital herpes . You can get HSV type 2 during sexual contact with someone who has a genital HSV-2 infection. The infection causes painful sores on the genitals in both men and women. HSV type 1 is the herpes virus that is usually responsible for cold sores of the mouth, the so-called " fever blisters." You get HSV-1 by coming into contact with the saliva of an infected person. However, HSV type 1 can cause genital herpes, usually caused by oral-genital sexual contact with a person who has the oral HSV-1 infection, and HSV type 2 can cause cold sores. Herpes can be treated but not cured. Symptoms appear briefly and then disappear; the disease lies dormant in nerve cells, but it may be reactivated by str...
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