Cold Sores

Cold sores typically start as small red bumps that develop into fluid-filled blisters, which can burst and form crusts. They can be itchy or painful and take anywhere from a few days to a couple of weeks to heal, sometimes accompanied by fever, swollen lymph nodes, and a general feeling of being unwell.

Once a person is infected with the herpes simplex virus, it can remain dormant in the body and reactivate later, causing cold sores to reoccur. There is no cure for the virus, but antiviral medications can be prescribed to reduce the frequency and severity of outbreaks, and over-the-counter creams and ointments can help relieve pain and itching.

What causes cold sores?

Cold sores are caused by the herpes simplex virus (HSV-1), transmitted through direct contact with an active sore or through contact with bodily fluids such as saliva — for example, kissing, sharing eating utensils, or close contact with someone who has an active sore. Certain triggers can cause the dormant virus to reactivate, including stress, sun exposure, fever, colds, or other viral infections. Some people may be more susceptible due to their immune system or a genetic predisposition. It is not possible to catch cold sores from a toilet seat or other inanimate object — the virus can only pass from person to person through direct contact.

Treatment options

A pharmacist may recommend several treatment options for cold sores:

• Antiviral creams: such as acyclovir or docosanol, applied to the affected area to reduce the duration and severity of outbreaks. Most effective when applied at the first sign of a cold sore.
• Oral antiviral medications: such as valacyclovir or famciclovir, prescribed to reduce the frequency and severity of outbreaks.
• Lip balms: some contain sunscreen to help reduce the risk of sun-induced outbreaks.
• Cold sore patches: adhesive patches applied over a cold sore to protect it and promote healing.
• Pain relievers: OTC options such as ibuprofen or acetaminophen relieve pain and discomfort.

Some OTC products may not be suitable for children, pregnant or breastfeeding women, or people with certain medical conditions — check with a pharmacist or doctor before using any OTC product for the first time.

Complications of cold sores

While cold sores are generally minor and common, complications can occur in some cases:

• Eye infections: cold sores can spread to the eyes, causing serious infections such as keratitis or even blindness.
• Skin infections: spread to the skin around the lips can lead to a bacterial infection with redness, pain, and pus-filled blisters.
• Brain infections: in rare cases, the virus can spread to the brain, causing encephalitis or meningitis.
• Neonatal herpes: in newborns, cold sores can be life-threatening if the virus spreads to the baby during delivery.
• Immune system problems: cold sores can be especially severe for people with weakened immune systems, such as those with HIV/AIDS or cancer.

If you are experiencing frequent, severe, or unusual cold sores, or if they are not responding to treatment, it's important to seek medical attention.

Preventing infection

1. Practice good hygiene: wash your hands frequently, especially after touching an active cold sore, and avoid sharing eating utensils, towels, or other personal items.
2. Avoid physical contact: avoid close contact, especially kissing, with someone who has an active cold sore.
3. Use sunscreen: a lip balm or protectant containing sunscreen can help protect against sun-induced outbreaks.
4. Avoid triggers: stress, sun exposure, colds, and other viral infections.
5. Keep the affected area clean and dry to speed healing and prevent secondary bacterial infections.

Getting enough sleep, eating a balanced diet, and keeping stress to a minimum help keep your immune system strong. You can spread the virus even without an active cold sore, so it's a good idea to inform others and take precautions. If you are pregnant, tell your healthcare provider about your history of cold sores, as the virus can be transmitted to the baby during birth.

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