Cold Sores are painful, fluid-filled and small blisters or sores which usually appear on the mouth, lips or nose which are caused by a virus. Usually it lasts for few days but this sore can be very painful. They are caused by herpes simplex virus. Often they are mistaken by a contagious mouth ulcer called canker sores. Cold sores are contagious. It occurs on the skin, mostly on the lips which is adjacent to mouth. Sometimes they may occur on nostrils, fingers, genitals and chin. Medically the cold sores are famous by the name of recurrent herpes labialis.
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