Both of these condition cause small sores to develop in or around the mouth, and often are confused with each other.

  1. Cancer sores occur only INSIDE the mouth-on the tongue and the inside linings of the cheeks, lips and throat.

  2. Fever blisters usually occur OUTSIDE the mouth-on the lips, chin, cheeks or in the nostrils.  If they do occur inside the mouth, it is usually on the gums or the roof of the mouth.  Inside the mouth, fiver blisters are smaller than canker sores, heal more quickly and often begin as a blister.

Fever Blisters

     They are caused by a contagious virus called herpes simplex.  There are two types of herpes simplex virus.

    Herpes simplex virus is highly contagious when fever blisters are present and is frequently spread by kissing.  Most people with type 1 virus become infected before the age of 10.

     In initial infection for most people have no symptoms.  15%, however, develop:

     Cause for a recurrence of fever blister:

  1. Emotional stress

  2. Fiver

  3. Illness

  4. Injury

  5. Exposure to sunlight

  6. Menstruation

     Treatment: None. 

     Some medication will relieve some of the pain and discomfort associated with the sores.  Here is what you can do:

     Click here to learn more about Canker sores.