Cold sores
Cold sores are common and usually clear up on their own within 10 days. There are things you can do to help ease the pain.
Prescription review online
A doctor will review your case and issue a prescription if medically appropriate.
Talk to a doctor online
Discuss your symptoms and possible next steps with a doctor online.
On this page
Medicines commonly prescribed for Cold sores
For informational purposes only. Always consult a doctor before using any medicine.
Dosage form: INJECTABLE PERFUSION, 250 mg acyclovirActive substance: aciclovirManufacturer: Accord Healthcare S.L.U.Prescription requiredDosage form: INJECTABLE PERFUSION, 25 mg acyclovir / mlActive substance: aciclovirManufacturer: Meiji Pharma Spain S.A.Prescription requiredDosage form: ORAL SOLUTION/SUSPENSION, 400 mg acyclovir / 5 mlActive substance: aciclovirManufacturer: Glaxosmithkline S.A.Prescription required
Cold sores are common and usually clear up on their own within 10 days. There are things you can do to help ease the pain.
Symptoms of a cold sore
A cold sore usually starts with a tingling, itching or burning feeling.
Over the next 48 hours one or more painful blisters will appear on your face.
Cold sores should start to heal within 10 days, but are contagious and may be irritating or painful while they heal.
Certain things may trigger a cold sore, such as illness, sunshine or being on your period.
When it's not a cold sore
| Symptoms | Possible causes |
|---|---|
|
Painful red spot on the face filled with pus |
Spot or boil |
|
Blister on the inside of the lip or mouth |
|
|
Red sores or blisters on the face that become crusty, golden-brown patches |
How long cold sores are contagious
Cold sores are contagious from the moment you first feel tingling or other signs of a cold sore coming on to when the cold sore has completely healed.
They can easily spread to other people and other parts of your body.
To help stop cold sores spreading:
- wash your hands with soap and water whenever you touch your cold sore
- do not kiss anyone while you have a cold sore
- do not have oral sex until your cold sore completely heals as you could give your partner genital herpes
Important
Kissing a baby if you have a cold sore can lead to neonatal herpes, which is very dangerous to newborn babies.
A pharmacist can help with cold sores
A pharmacist can recommend:
- creams to ease pain and irritation
- antiviral creams to speed up healing time
- cold sore patches to protect the skin while it heals
You can buy electronic devices from pharmacies that treat cold sores with light or lasers.
You may find these helpful, but there's not much evidence to confirm they work.
If you regularly get cold sores, use antiviral creams as soon as you recognise the early tingling feeling. They do not always work after blisters appear.
Things you can do yourself to help with cold sores
There are things you can do to help ease cold sores while they heal and to avoid triggering a cold sore.
Consult with a doctor about Cold sores
Discuss your symptoms and possible next steps with a doctor online.
Do
-
avoid anything that triggers your cold sores, such as sunbeds
-
use sunblock lip balm (SPF 15 or above) if you're outside in the sun
-
take paracetamol or ibuprofen to ease pain and swelling (liquid paracetamol is available for children) – do not give aspirin to children under 16
-
drink plenty of fluids to avoid dehydration
Don’t
-
do not touch your cold sore (apart from applying antiviral cream) – and if you do wash your hands before and after
-
do not rub cream into the cold sore – dab it on instead
-
do not eat acidic or salty food if it makes your cold sore feel worse
See a GP if:
- a cold sore has not started to heal within 10 days
- you're worried about a cold sore or think it's something else
- the cold sore is very large or painful
- you or your child also have swollen, painful gums and sores in the mouth (gingivostomatitis)
- you have a weakened immune system – for example, because of chemotherapy or diabetes
Treatment for cold sores from a GP
A GP may prescribe antiviral tablets if your cold sores are very large, painful or keep coming back.
Newborn babies, pregnant women and people with a weakened immune system may be referred to hospital for advice or treatment.
Why cold sores come back
Cold sores are caused by a virus called herpes simplex.
Most people are exposed to the virus when they're children after close skin to skin contact, such as kissing, with someone who has a cold sore.
Once you have the virus, it stays in your skin for the rest of your life. Sometimes it causes a cold sore.
Online doctors for Cold sores
Discuss your symptoms and possible next steps for Cold sores with a doctor online.
