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Causes. Cold sores are caused by certain strains of the herpes simplex virus (HSV). HSV-1 usually causes cold sores. HSV-2 is often the cause of genital herpes. But either type can spread to the face or genitals through close contact, such as kissing or oral sex.
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...
A cold sore (also called a fever blister) is a skin blister associated with a herpes simplex virus (HSV) infection. Cold sores typically form on your lips or the skin around your mouth. But they can also develop on other areas of your face, including your nose, cheeks or chin.
Cold sores can be triggered by many different things that put stress on your body, such as: The common cold, the flu and other illnesses. Damaged or cracked skin from eczema or sunburn. Extreme hot or cold weather. Hormonal changes, like the ones experienced as part of the menstrual cycle or pregnancy.
Cold sores are painful blisters caused by an infection with the herpes simplex virus (HSV). Learn more about the causes, risk factors, symptoms, treatment, complications, and prevention...
What causes cold sores? A virus causes cold sores. Most cold sores are caused by the herpes simplex virus (HSV). More than half of Americans ages 14 to 49 carry this virus. Once you get the virus that causes cold sores, you have it for life. After the sores clear, the virus travels to your nerves, where it stays unless it reawakens.
Cold sores cause small blisters on the lips and mouth that enlarge, burst, then crust over. Early treatment can promote healing and reduce the time it takes a cold sore to heal. Using antiviral medicine on the sores does not prevent them or help them heal faster.
Learn about cold sore causes, risk factors, symptoms, treatment, how to tell if it's a canker sore, and more. Cold sores are red, fluid-filled blisters that usually form near your mouth or...
Risk factors. Anyone who has HSV-1 or HSV-2 is at risk of developing cold sores. According to the World Health Organization (WHO), 67 percent of the global population under age 50 has...
Cold sores are painful, fluid-filled blisters that most commonly appear on your mouth. Treatments include antiviral medications and supportive care.