Some common home remedies for fever blisters include covering the blister with petroleum jelly, using antiviral medications and applying sunscreen to the lips, according to HowStuffWorks. Getting a new toothbrush can also help to treat fever blisters because the virus that causes the blister may remain in the toothbrush.
It is important that a person who has a fever blister not touch it, according to HowStuffWorks. Touching the fever blister may introduce bacteria, and since fever blisters are very contagious, infected individuals may spread bacteria to other areas of the body, such as their eyes. Over-the-counter pain relievers can help ease the pain of a fever blister. Icing the fever blister can also help reduce the pain and help cut down on the longevity of the cold sore. Applying milk to the fever blister may also cut down on the length of time that the blister remains on the mouth.
Avoiding triggers is also important when treating a fever blister, according to HowStuffWorks. For instance, a sunburn can trigger a fever blister, and those who are prone to developing sunburns are recommended to stay out of the sun. Since stress is also a trigger for some people, stress-fighting techniques are also important for treating fever blisters. There is also evidence that glycyrrhizic acid, a compound found in licorice, may also help treat fever blisters.