It is possible to find pictures of fever blisters at online health or medical information sources like WebMD and MedicineNet. Fever blisters, also referred to as cold sores, can develop on the lip and around the mouth. The main cause of fever blisters is the herpes simplex virus, as explained by WebMD.
Either herpes simplex virus 1 or herpes simplex virus 2 can cause fever blisters. A person contracts the virus through a simple cut or break in the skin around the lip or mouth.
Fever blisters appear as red and swollen areas. They often ooze a fluid and will heal in about 2 weeks. The spread of this virus occurs through contact with a person that has these blisters. The type of contact could be using eating utensil or touching saliva from an infected person, as noted by MedicineNet.