Cold sores, also known as herpes labialis, are small blisters that develop on the lips or around the mouth. They are caused by the herpes simplex virus and are highly contagious. The blisters are often painful and can be triggered by stress, illness or sun exposure.

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Herpes Labialis FAQ


What causes cold sores?

Cold sores are caused by the herpes simplex virus (HSV-1).

Are cold sores contagious?

Yes, cold sores are highly contagious especially when the blister is open.

How long do cold sores last?

Cold sores typically last for 7-10 days.

Can cold sores be cured?

There is no cure for the herpes simplex virus, but antiviral medications can help manage and reduce outbreaks.

What triggers cold sore outbreaks?

Stress, illness, sun exposure, and hormonal changes can trigger cold sore outbreaks.

How are cold sores diagnosed?

Cold sores are usually diagnosed based on their appearance and symptoms. A viral culture or blood test may be done in some cases.

When is the herpes simplex virus most contagious?

The herpes simplex virus is most contagious when cold sores are present.

Can cold sores appear on areas other than the lips?

Yes, cold sores can also appear on the nostrils, chin, or fingers.

What are the available treatment options for cold sores?

Treatment options include antiviral creams, oral antiviral medications, and over-the-counter ointments to relieve symptoms.

Can cold sores lead to other health complications?

In rare cases, the herpes simplex virus can cause more severe symptoms in individuals with weakened immune systems.

How can I prevent cold sore outbreaks?

Avoiding triggers, managing stress, and using sunscreen on the lips can help prevent cold sore outbreaks.

Can I apply makeup to cover a cold sore?

It's best to avoid applying makeup to a cold sore as it may slow down the healing process and increase the risk of infection.

Are there any natural remedies for cold sores?

Some people find relief from cold sores with lemon balm, aloe vera, or lysine supplements, but it's important to consult a healthcare professional before using any natural remedies.

Can children get cold sores?

Yes, children can also get cold sores, especially after being in contact with an infected person.

Is it safe to kiss someone with a cold sore?

It's best to avoid kissing or sharing utensils with someone with an active cold sore to prevent transmission of the virus.

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Information provided by Maryam Abdullahi-Mahdi. Reviewed by Mr. Matthew Liew