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Cold sore treatment

What are cold sores?

Cold sores are small blisters that typically appear on or around the lips, caused by the herpes simplex virus type 1 (HSV-1). They are extremely common, with the majority of adults in the UK carrying the virus, often acquired in childhood through non-sexual contact such as a kiss from a family member.

Like genital herpes, cold sores are a lifelong condition. Once HSV-1 is present in the body, the virus remains dormant in nerve tissue and can reactivate periodically, causing recurrent outbreaks. Triggers vary between individuals and can include illness, stress, sun exposure, hormonal changes, and fatigue.

Most cold sore outbreaks are mild and resolve on their own within seven to ten days. However, for people who experience frequent, severe, or prolonged outbreaks, antiviral treatment can reduce duration and discomfort.

Available treatment approaches

• Topical antiviral treatment (over the counter)
• Oral antiviral treatment (prescription)
• Suppressive antiviral therapy for frequent recurrences
• Self-care and outbreak management

How the assessment process works

• Complete a short, secure medical questionnaire.
• Select a treatment category for assessment.
• An independent UK-registered prescriber reviews your information and determines whether medical treatment may be appropriate.
• Next steps are arranged following clinical approval.

Understanding cold sores and treatment options

Cold sores typically follow a predictable pattern. Most people notice a tingling, itching or burning sensation around the lips before any visible blistering appears. This prodromal phase is followed by the appearance of one or more fluid-filled blisters, which then burst, crust over, and heal.

The entire cycle typically takes seven to ten days. Outbreaks vary in frequency between individuals. Some people experience one or two episodes per year; others have more frequent recurrences that can significantly affect confidence and quality of life.

Cold sores are contagious from the moment early symptoms appear until the sore has fully healed. The virus spreads through direct contact with the affected area, including kissing and oral contact. It is important to avoid close facial contact with others, particularly newborns and people with weakened immune systems, during an active outbreak.

How cold sores are diagnosed

Cold sores are usually diagnosed clinically, based on the characteristic appearance and location of the blisters. Laboratory testing is not routinely required for typical presentations, though a swab from an active sore may be taken in cases of diagnostic uncertainty or to confirm the HSV type.

When should cold sores be treated?

Treatment is not always necessary for mild, infrequent cold sores that resolve quickly without significant discomfort. However, antiviral treatment may be appropriate in the following situations.

Episodic treatment: For outbreaks that are painful, prolonged, or affecting daily life, antiviral treatment started at the earliest sign of an episode can reduce severity and shorten duration.

Suppressive therapy: For people who experience frequent recurrences (typically six or more per year), daily antiviral treatment can reduce the frequency of outbreaks significantly.

Immunocompromised patients: People with weakened immune systems, including those on immunosuppressant medicines or undergoing chemotherapy, may require antiviral treatment for cold sores under specialist supervision, as outbreaks can be more severe and prolonged.

Which healthcare professionals can support cold sore treatment?

Cold sores are most commonly managed through primary care and pharmacy, with online prescribing offering a convenient route for those who prefer it. The following healthcare professionals may be involved depending on your circumstances.

Pharmacist
Pharmacists can recommend and supply over-the-counter topical antiviral treatments for mild cold sores without a prescription. They can also advise on self-care and when to seek further medical assessment.

General practitioner (GP)
GPs can prescribe oral antiviral treatment for frequent or severe outbreaks and can refer to specialist services where complications arise or where immunosuppression is a factor.

UK-registered online prescriber
A UK-registered prescriber can assess suitability for oral antiviral treatment through a secure online process, including both episodic and suppressive approaches, following a clinical questionnaire.

Ophthalmologist
If a cold sore affects or spreads near the eye, specialist assessment from an ophthalmologist is required promptly to prevent potential damage to vision.

Immunologist or specialist physician
For people with frequent severe outbreaks linked to an underlying immune condition, specialist input may be appropriate.

How are cold sores managed?

Management depends on the frequency and severity of outbreaks. For most people, a combination of antiviral treatment and self-care is sufficient.

• Topical antiviral cream: Available over the counter for mild outbreaks; most effective when applied at the first sign of tingling or itching, before blistering develops
• Oral antiviral treatment: Prescription medicines that work systemically to reduce outbreak severity and duration; more effective than topical treatment for moderate to severe episodes
• Suppressive therapy: Daily oral antiviral treatment to reduce recurrence frequency in people with frequent outbreaks
• Self-care: Keeping the affected area clean, avoiding touching the sore and then other areas of the face, using sun protection on the lips (a known trigger), and avoiding close contact with vulnerable individuals during an active outbreak

Medicines that may be considered

Where clinically appropriate, a UK-registered prescriber may consider antiviral treatment for cold sores. Suitability depends on individual health profile, frequency and severity of outbreaks, any relevant allergies, and current clinical guidance.

Aciclovir (topical)

Available over the counter as a cream (for example, Zovirax). Applied to the affected area at the first sign of an outbreak and used five times daily for five days. Most effective when started during the prodromal phase before blistering appears.

Aciclovir (oral)

A prescription antiviral tablet taken multiple times daily for episodic or suppressive treatment. Well established with an extensive safety record.

Valaciclovir (oral)

A prodrug of aciclovir that achieves higher blood levels with less frequent dosing. Often preferred for suppressive therapy due to the simpler dosing schedule. Available on prescription.

Famciclovir (oral)

An alternative oral antiviral that may be considered in certain clinical circumstances, including where other antivirals are not tolerated.

How DoktorABC UK supports access to care

DoktorABC UK is a digital health platform that connects patients with independent, UK-registered healthcare professionals. Patients can access a clinical assessment through a secure online process.

A UK-registered prescriber reviews the information you provide and determines whether treatment may be appropriate for you. If treatment is considered suitable, a prescription is issued by the UK-registered prescriber in accordance with UK regulations.

DoktorABC UK does not itself provide medical care, issue prescriptions or dispense medicines. All clinical decisions are made by the independent prescribing healthcare professional following an individual assessment.

Summary

Cold sores are a common, manageable condition caused by the herpes simplex virus. For most people, mild outbreaks resolve without treatment. For those with frequent, severe, or prolonged episodes, antiviral treatment, whether topical or oral, can significantly reduce the impact on daily life. A UK-registered prescriber can assess your individual circumstances and advise on whether episodic or suppressive therapy is the most appropriate approach for you.