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Dermatology

Patient Information Leaflet: Cold Sore Cream

Quick summary Cold sores are usually caused by the herpes simplex virus. This leaflet-style guide explains common triggers, symptoms, how cold sore cream is typically used, and when to ask a pharmacist or GP...

Educational content Use this article as a starting point for understanding the topic.
Check with a professional Ask a doctor or pharmacist before changing any medicine.
Safety first Side effects, interactions and risks depend on each person.
Medical disclaimer

This content is for educational purposes only and does not replace medical advice, diagnosis or treatment from a qualified healthcare professional.

Quick summary

Cold sores are usually caused by the herpes simplex virus. This leaflet-style guide explains common triggers, symptoms, how cold sore cream is typically used, and when to ask a pharmacist or GP for advice.

Medical disclaimer: This article is for general information only and does not replace the patient information leaflet that comes with your medicine, or advice from a doctor or pharmacist. Always follow the instructions supplied with your specific product.

What causes cold sores?

Cold sores are commonly caused by the herpes simplex virus, usually HSV-1. After the first infection, the virus can stay in the body and become active again later.

Outbreaks may happen when the body is under stress or when you are unwell. Commonly mentioned factors include illness, fatigue, stress, and exposure to sunlight.

What can trigger a cold sore outbreak?

Triggers can vary from person to person. Some people notice outbreaks after emotional stress, while others link them to physical factors such as fever, sun exposure, or hormonal changes.

  • Stress
  • Illness
  • Hormonal changes
  • Sun exposure

Not everyone has the same triggers, so it can help to notice patterns over time.

What are the symptoms of a cold sore?

Cold sores often begin with a tingling, burning, or itching feeling around the lips or mouth. This may be followed by small painful blisters.

The blisters can ooze and then crust over as they heal. Symptoms may last several days and can be uncomfortable.

Recognising the early signs may help you use treatment sooner, if that is what your product leaflet advises.

Are cold sores contagious?

Yes. Cold sores can spread through direct contact with the sore or saliva, including when a sore is not clearly visible.

Good hygiene matters. Avoid sharing cups, cutlery, towels, or lip products, and wash your hands regularly.

Extra care is important around newborn babies, pregnant women, and people with weakened immune systems.

How is cold sore cream usually used?

Cold sore creams such as aciclovir cream are topical antiviral medicines. They are generally used on the affected area and are often most helpful when started at the first sign of symptoms.

The current content states that aciclovir cream is typically applied five times daily for about five days, but you should always check the instructions in the patient information leaflet for your exact product.

  • Apply at the first sign of symptoms, if advised by the leaflet
  • Use only as directed in the product instructions
  • Wash hands before and after application

Do not use more often or for longer than the leaflet says unless a healthcare professional tells you to.

About aciclovir cream

Aciclovir cream is described as a topical antiviral treatment for cold sores. It is used to help reduce the severity and duration of outbreaks when used as directed.

Some people may notice mild skin irritation. If you develop anything unusual or troublesome, seek advice from a pharmacist or doctor.

When should I contact my GP?

You may want to speak to a GP if cold sores happen often, if symptoms are severe, or if the cream does not seem to help.

It is also sensible to ask for medical advice if you are unsure whether the sore is a cold sore, or if you have concerns about using the product safely.

If you have a severe reaction after using the cream, seek medical help promptly.

Helpful things to check in the patient information leaflet

If you have the leaflet for your cold sore cream, it is worth checking the following details before use:

  • How often to apply the cream
  • How long to use it for
  • Where it should and should not be applied
  • What to do if you miss a dose
  • Possible side effects and warnings

If anything in the leaflet is unclear, a pharmacist can help explain it.

FAQ

▸ What is the best cream for a cold sore?

The current content highlights aciclovir cold sore cream as a commonly used option. The best choice for you depends on the product instructions and advice from a pharmacist or doctor.

▸ What cream do doctors give for cold sores?

Doctors may recommend aciclovir cream for cold sores. In some cases, they may also consider other treatments depending on the person and the severity of symptoms.

▸ What are the directions for cold sore cream?

Directions vary by product, so always follow the patient information leaflet. The current content says aciclovir cream is typically applied five times a day for about five days.

▸ What happens if you use too much cold sore cream?

Using too much may increase the chance of skin irritation or discomfort. If you are worried after applying extra cream, ask a pharmacist or doctor for advice.

▸ Are cold sores contagious even when there is no blister?

Yes, the virus can spread even when a sore is not clearly visible. That is why hygiene and avoiding direct contact are important.

Safety reminder: If symptoms are severe, frequent, or unusual, or if you are unsure whether the sore is a cold sore, speak to a pharmacist or GP. Always read the leaflet that comes with your medicine and follow it carefully.

Editorial note Active Ingredients Online Editorial Team This article is prepared as educational medicine information for general readers. It is written to support understanding of active ingredients, medicine uses, possible side effects, precautions and safety-related questions.
Published: December 2, 2024 Updated: August 17, 2026 Educational content

Medical disclaimer

This content is for educational purposes only. It should not be used as a substitute for professional medical advice, diagnosis or treatment. Always ask a doctor, pharmacist or qualified healthcare professional before starting, stopping or changing any medicine.

Sources and verification

The following sources or official references are listed to support verification of the medicine information discussed in this article.

Final note

Medicine information can change and may vary depending on country, product formulation, patient history and professional guidance. Always check official medicine information and ask a healthcare professional for personal medical questions.

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