COLD sores always seem to flare out when you're least wanting them – such as before a holiday or job interview.

But they are a common skin complaint which normally go away by themselves within a few days, although you should be more vigilant if your child has one – so here's everything you need to know.

What is a cold sore?

Cold sores, also known as herpes labialis, is an infection by the herpes simplex virus which mostly affects the lips.

It can be accompanied by a fever or sore throat, and is usually spread by non-sexual contact between humans, although contact with the genitals can cause genetic herpes.

They may be unsightly and slightly uncomfortable, but they are a common condition, affecting most people in their lifetime.

When are they no longer contagious?

Cold sores are contagious until they’ve completely cleared up, which usually takes around ten days.

Avoid kissing others and engaging in oral sex until the infection has cleared up, and also don’t share lip products, toothbrushes, and water bottles.

Even before the cold sore appears, for a couple of days beforehand you are contagious, so practising good oral hygiene is always important whether or not you have one.

The virus remains dormant in the body, which can reactivate into another outbreak later in life.

Can babies get them?

Babies can suffer from cold sores, which are known as neonatal herpes.

This can be very serious, as their immune system isn’t fully developed and can’t fight off viruses so easily.

Babies can catch them if the mother catches genital herpes during the last six weeks of pregnancy, as the mother can pass on the infection during labour.

After birth, someone with a cold sore can spread the infection by kissing the baby, or if the breastfeeding mother has a herpes sore on her breast.

A baby infected with herpes may be sleepy, have a high-pitched cry, rapid breathing, a rash, or lack of appetite.

If you think your baby may have one, then contact your GP who may even recommend taking your child to A&E.

If the condition spreads to the baby’s organs, there is a high chance that the baby will die, so acting early could save a life.

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How do you get rid of one?

According to the NHS, there are ways to tackle the problem if you get one. Your doctor may prescribe antiviral tablets, or you could ask your pharmacist to recommend an over-the-counter product.

• Avoid anything acidic and salty, and opt for cool and soft foods instead
• Use an antiseptic mouthwash to keep your mouth clean if brushing your teeth is painful
• Avoid touching it – if your GP prescribes a cream, dab it on the affected area instead of rubbing it in
• Wash your hands regularly, and especially before applying cream

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