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A cold sore is a small, painful, fluid-filled blister or cluster of blisters that typically appears on or around the lips. It's caused by the herpes simplex virus type 1 (HSV-1), also known as oral herpes, and is sometimes called a fever blister or herpes labialis. Cold sores are extremely common, affecting an estimated 60% to 95% of adults worldwide, with most people first becoming infected during childhood or adolescence.
How did I get a cold sore?
Cold sores spread through direct contact with someone who has the herpes simplex virus (HSV-1). This can happen through kissing, oral sex, or sharing items like drinks, lip balm, utensils, or razors. Many people are first exposed to the virus during childhood or adolescence, even if the person who passed it to them didn't have a visible cold sore at the time.
Yes. Cold sores are contagious and can spread the herpes simplex virus (HSV-1) to others. You're most contagious during the early tingling, itching, or burning stage before a blister appears (called the prodrome), as well as while blisters are present, whether they're intact, leaking fluid, or crusting over. Avoid close contact, such as kissing or oral sex, and don't share personal items until the sore has completely healed.
How long does a cold sore last?
Most cold sores heal within 7 to 14 days. They typically begin with a tingling, itching, or burning sensation, followed by the formation of fluid-filled blisters. The blisters then break open, crust over, and gradually heal, usually without leaving a scar.
Several factors can trigger a cold sore outbreak after the virus has been dormant. Common triggers include stress, illnesses like the common cold or flu, sun exposure, hormonal changes, fatigue, dental procedures, a weakened immune system, and menstruation.
While it's not always possible to prevent a cold sore outbreak, you can reduce your risk by using a lip balm with SPF, managing stress, getting enough sleep, supporting your immune system, and avoiding your known triggers. If you experience frequent outbreaks, such as five or more in a year, talk to a healthcare provider about whether daily antiviral medication may be right for you.
Cold sores can often be managed with a combination of treatments to reduce symptoms and help speed healing. Options include:
- Over-the-counter antiviral creams, such as Abreva®, which may help shorten healing time.
- Prescription oral antiviral medications, which work best when started at the first sign of tingling, itching, or burning before a blister appears.
- Pain relievers, such as ibuprofen or acetaminophen, to help reduce discomfort.
- Cold compresses to soothe pain and swelling.
- Petroleum jelly to keep the sore moisturized and help prevent cracking while it heals.
What is the main cause of cold sores?
Cold sores are caused by the herpes simplex virus (HSV), most commonly HSV-1. Once you're infected, the virus stays in your body for life and can become active again from time to time, leading to new cold sore outbreaks. Common triggers include stress, illness, sun exposure, hormonal changes, and a weakened immune system.
Can cold sores be non-STD?
Yes. Most cold sores are caused by HSV-1 and are not considered a sexually transmitted infection. The virus is commonly spread through nonsexual close contact, such as kissing or sharing items like drinks, utensils, or lip balm. However, HSV-1 can also be transmitted through oral sex and cause genital herpes.
