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   What causes fever blisters?

   • Fever blisters result from infection with a herpes simplex virus. Antiviral medications may help manage them. Cold sores usually cause pain, a burning sensation, or itching before they burst and crust over. People sometimes call them fever blisters. The most common cause of cold sores is the herpes simplex virus type 1 (HSV-1).

   Cold sores (fever blisters): Causes, symptoms, treatment, and more

   www.medicalnewstoday.com/articles/172389

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   What causes a cold sore after a herpes infection?

   • Once you've had a herpes infection, the virus can hide in nerve cells in the skin and may cause another cold sore at the same place as before. A return of cold sores may be triggered by: Viral infection or fever. Hormonal changes, such as those related to a menstrual period. Stress.

   Cold sore - Symptoms and causes - Mayo Clinic

   www.mayoclinic.org/diseases-conditions/cold-sore/symptoms-causes/syc-20371017

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   What causes cold sores if you don't see them?

   • They're usually caused by herpes simplex virus type 1 (HSV-1), and less commonly herpes simplex virus type 2 (HSV-2). Both of these viruses can affect the mouth or genitals and can be spread by oral sex. The virus can spread even if you don't see the sores. There's no cure for cold sores, but treatment can help manage outbreaks.

   Cold sore - Symptoms and causes - Mayo Clinic

   www.mayoclinic.org/diseases-conditions/cold-sore/symptoms-causes/syc-20371017

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2. www.mayoclinic.org › diseases-conditions › cold-soreCold sore - Symptoms and causes - Mayo Clinic

   www.mayoclinic.org › diseases-conditions › cold-sore

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   Jan 5, 2024 · Cold sores, or fever blisters, are a common viral infection. They are tiny, fluid-filled blisters on and around the lips. These blisters are often grouped together in patches. After the blisters break, a scab forms that can last several days. Cold sores usually heal in 2 to 3 weeks without leaving a scar.

3. health.clevelandclinic.org › what-triggers-cold-soresWhat Triggers Cold Sores? - Cleveland Clinic Health Essentials

   health.clevelandclinic.org › what-triggers-cold-sores

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   Policy. Internal medicine physician Rafael Fernandez Bohorquez, MD, explains what causes cold sores and what to do when you feel one coming on. Why do I get cold sores? Cold sores are the result of a herpes simplex virus (HSV) infection, the same virus that causes genital herpes.

4. www.webmd.com › understanding-cold-sores-basicsCold Sores: Causes, Symptoms, Treatment, Complications, and ...

   www.webmd.com › understanding-cold-sores-basics

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   May 10, 2023 · What Is a Cold Sore? A cold sore is a group of tiny, painful blisters caused by the herpes simplex virus (HSV). They’re also called fever blisters or herpes simplex labialis.

5. my.clevelandclinic.org › health › diseasesCold Sore: Causes, Treatment & Prevention - Cleveland Clinic

   my.clevelandclinic.org › health › diseases

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   Apr 27, 2023 · A cold sore is a fluid-filled blister (or a cluster of blisters) that usually appears on your lip or around your mouth. They can also affect your cheeks, nose and chin. The herpes simplex virus type 1 (HSV-1) causes most cold sores.

6. www.webmd.com › understanding-cold-sores-symptomsCold Sore Symptoms: How Do I Know If I Have a Cold Sore? - WebMD

   www.webmd.com › understanding-cold-sores-symptoms

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   Sep 15, 2023 · 1 min read. What Are the Symptoms of Cold Sores? The symptoms of cold sores include: Fluid-filled blisters or red, painful, burning, or itching sores that are typically on or near the...

7. www.healthline.com › health › 6-causes-and-triggers6 Causes and Triggers of Cold Sores - Healthline

   www.healthline.com › health › 6-causes-and-triggers

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   Nov 19, 2021 · Stress, illness, hormones, and more can trigger outbreaks. Cold sores are painful, open blisters that develop in or around your mouth, usually on your lips. After you get an HSV...

8. www.medicalnewstoday.com › articles › 172389Cold sores (fever blisters): Causes, symptoms, treatment, and ...

   www.medicalnewstoday.com › articles › 172389

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   Nov 9, 2023 · Cold sores usually cause pain, a burning sensation, or itching before they burst and crust over. People sometimes call them fever blisters. The most common cause of cold sores is the herpes ...