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Cold sores or fever blisters are normally caused by the herpes simplex virus. This virus often takes place around the lips and mouth area. They appear to be red blisters which are often painful and annoying.


It's pretty much kinda like herpes. You can get it from someone who has it. Both herpes simplex virus 1 (HSV-1) and herpes simplex virus 2 (HSV-2) cause herpes complex.
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Ila Harris

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1y ago
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Adrianna Wiegand

Lvl 10
1y ago

Cold sores or fever blisters are normally caused by the herpes simplex virus. This virus often takes place around the lips and mouth area. They appear to be red blisters which are often painful and annoying.


It's pretty much kinda like herpes. You can get it from someone who has it. Both herpes simplex virus 1 (HSV-1) and herpes simplex virus 2 (HSV-2) cause herpes complex.
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Wiki User

13y ago

Cold Sores are caused by Herpes Symplex 1, which is similar to Herpes Symplex 2, which is genital herpes. Herpes Symplex 1 is a virus usually passed down from a parent, and never goes away, and will flare up occasionally, causing cold sores.

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Wiki User

7y ago

Cold sores are brought on by the herpes virus.

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Q: What causes cold sores?
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Related questions

What skin ailment causes cold sores?

The herpes virus causes cold sores.


What is herpes in cold sores?

Te herpes virus causes cold sores.


Could you get cold sores by sucking your thumb?

Could trigger a break out if you suck your thumb rather vigorously, but that isn't what causes cold sores. Cold sores are caused by a virus.


Can sunburn cause cold sores?

Getting a sun burn doesn't cause a cold sores but it can trigger break outs. The oral herpes virus is what causes cold sores.


What causes cold sores and warts?

Both cold sores and warts are caused by viruses. Cold sores are caused by herpes simplex virus. Warts are caused by HPV (human papillomavirus).


What is the pathogen of cold sores?

Cold sores are not caused by organisms, they are caused by a virus called oral herpes.


Can you get a body rash from cold sores?

Cold Sores (herpes virus) are from the Varicella Virus which also causes Chickenpox and Shingles so yes.


What is the difference between a cold sore fever blister and herpes?

Canker sores an cold sores are not the same thing. Oral herpes is caused by a contagious virus. Cold sores can cause a lot of discomfort or pain and they affect the out side of the mouth. Canker sores are caused by bacteria and as far as I know they are not contagious. Canker sores are raise white slightly itchy masses that occuron the inside of the mouth.


Can it cause a sore?

Infection with the herpes virus causes cold sores.


What causes cold sores chickenpox and other diseases?

Cold sores and chickenpox are caused by viruses. Other diseases can be cause by viruses as well but also bacteria.


What is the drug for canker sores?

FYI canaker sores are not related to oral herpes (the virus that causes cold sores). See related link for some remedies.


What causes cold sores explain the process?

Cold sores occur when your immune system is run down or lowered by stress. They can also be triggered by being out in the sun or in cold weather for long periods of time.