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A small blister that comes up on or around the lips area and is often filled with some sort of fluid is called as cold sore. These sores are very sensitive to any quick changes that occur in the environment and are extremely painful for the person, and are hence referred as cold sores. These sores are created by a virus that spreads very easily from person to person and is called as herpes virus. Cold sores are a very common mouth problem for a lot of people all around the world. The type 1 virus spreads cold sores that are contagious in spreading while type 2 viruses spread as genital disease.