Cold sore on lip are red, fluid-filled blisters that form on the lip or around the mouth or other areas of the face. They usually appear as cluster of tiny blisters on the lip. They are caused by herpes simplex virus 1 (HSV-1). The HSV-1 can be passed from one person to another through saliva, either by direct contact or by drinking from the same cup or glass or through skin contact.

According to experts, about 8 out of every 10 people have the virus that causes cold sores. Most people are infected at the infant stage (before they are 10 years old).

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How to get rid of cold sores fast