Cold sores additionally called fever blisters are a typical viral contamination. They are small, fluid-filled blisters on and around your lips. Often these blisters are grouped together in patches. After the blisters break, a crust forms that can last for several days. Cold sores usually heal within two to three weeks without leaving a scar.Cold sores are spread from person to person through close contact, such as kissing. It is usually caused by the herpes simplex virus type 1 (HSV-1), and the less common type 2 herpes simplex virus (HSV-2). Both of these viruses can affect your mouth or genitals
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