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Herpes Labialis – Cold Sores: Causes and Treatment

Herpes labialis, commonly known as a cold sore, is a viral infection of the lips caused by herpes simplex virus type 1. It presents as painful blisters and is highly contagious.

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Things worth knowing about "Herpes labialis"

Herpes labialis, commonly known as a cold sore, is a viral infection of the lips caused by herpes simplex virus type 1. It presents as painful blisters and is highly contagious.

What is Herpes Labialis?

Herpes labialis, commonly referred to as a cold sore or fever blister, is a viral infection caused by herpes simplex virus type 1 (HSV-1). It is one of the most widespread infectious conditions worldwide. Once a person is infected, the virus remains in the body for life and can reactivate at any time.

Causes and Transmission

The initial infection most often occurs during childhood through direct contact with infected saliva or mucous membranes, for example through kissing or sharing utensils. After the first infection, the virus retreats into nerve cells, where it remains dormant. Various triggers can cause reactivation:

Stress and emotional strain
Fatigue and lack of sleep
Sun exposure or extreme cold
A weakened immune system (e.g., during a cold or flu)
Hormonal changes (e.g., menstruation)
Minor injuries around the lips

Symptoms

Herpes labialis typically progresses through several distinct stages:

Prodromal phase: Tingling, itching, burning, or a feeling of tightness around the lips – usually 1 to 2 days before blisters appear.
Blister phase: Small, fluid-filled blisters form on or around the lips.
Open sore phase: The blisters burst, leaving small painful ulcers.
Crusting phase: The sores crust over and heal within 7 to 10 days.

Diagnosis

In most cases, herpes labialis can be diagnosed based on its characteristic appearance during a clinical examination. In uncertain cases or if complications are suspected, the following tests may be performed:

Swab of blister fluid for laboratory analysis (PCR test)
Blood test for herpes simplex antibodies

Treatment

There is no cure for herpes labialis, as the virus remains in the body permanently. Treatment focuses on relieving symptoms and shortening the duration of an outbreak.

Topical Treatment

Antiviral creams or gels containing aciclovir or penciclovir can reduce the severity and duration of an outbreak when applied early during the prodromal phase. These are available over the counter at pharmacies.

Systemic Treatment

For frequent or severe outbreaks, a physician may prescribe antiviral tablets such as aciclovir, valaciclovir, or famciclovir. These significantly shorten healing time and can be used as long-term therapy to prevent recurrences.

Home Remedies and Supportive Measures

Applying a cool compress to relieve pain
Using lip balms or creams with SPF to protect against UV radiation
Getting adequate sleep and managing stress to support immune function

Contagion Risk and Prevention

Herpes labialis is highly contagious, especially during the blister and open sore phases. The following measures can help prevent transmission:

Avoid direct skin contact with blisters
Do not share utensils, glasses, or towels
Wash hands frequently
Avoid close contact with newborns, pregnant individuals, and immunocompromised persons during an active outbreak

References

World Health Organization (WHO): Herpes simplex virus. Fact Sheet. Available at: www.who.int
Opstelten W, Neven AK, Eekhof J. Treatment and prevention of herpes labialis. Canadian Family Physician. 2008;54(12):1683-1687.
Fatahzadeh M, Schwartz RA. Human herpes simplex virus infections: epidemiology, pathogenesis, symptomatology, diagnosis, and management. Journal of the American Academy of Dermatology. 2007;57(5):737-763.

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