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Cold sores are viruses that appear usually on the outer side of the lip. They can also appear on the nose as well. Around the mouth area is the typical place to find them. Cold sores are common mouth sores that usually aren't threatening to long-term health. There are effective ways to treat cold sold sores. They'll usually go away on their own, but they can often reoccur. So prevention can be key as well when treating cold sores. Cold sores are often called fever blisters. There are two different types of viruses called herpes simplex virus-1 and 2. The virus can cause genital herpes.