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Cold sores are red blisters full of fluid that usually appear around the lips and nose. Caused by a common viral infection, cold sores may also develop inside the mouth and can spread to the fingers. Cold sores are highly prevalent: 90 percent of the adult population carries the virus that causes them, though some people remain asymptomatic.

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1. Cold Sore Causes

A type of the herpes simplex virus — HSV-1 — is usually responsible for cold sores. HSV-2 results in genital herpes, but can also cause facial sores. HSV infects more than 50 percent of Americans by the time they enter their 20s. A lot of people who have the virus never develop visible cold sores, but they can still pass the virus on. People with visible cold sores are most contagious, but the virus also spreads through close contact and shared food or cosmetics.

cold sore near mouth lolostock / Getty Images
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Disclaimer

This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.