Disease Description (Causes and Symptoms)
- Definition: Herpes labialis, commonly known as cold sores, is a vesicular infection that recurs mainly around the lips and is caused by the herpes simplex virus (mostly HSV‑1). After infection, the virus remains latent in sensory ganglia (such as the trigeminal ganglion) and is reactivated by fever, stress, ultraviolet light, menstruation, immunosuppression, and other factors.
- Main symptoms: Initially, burning or tingling sensations (prodromal symptoms) occur, followed by a small number of clustered vesicles. When the vesicles burst, scabs form, and the condition improves within 7–14 days. Pain, itching, and changes in skin color may occur. It is generally localized and usually heals without scarring.
Treatment Methods
- Goals: Suppress viral replication, relieve symptoms, shorten recovery time, and prevent complications.
- Antiviral medications
- Oral medications (generally the most effective): acyclovir, valacyclovir, and famciclovir. They are most effective when administered early (during the prodromal stage or at the onset of symptoms). The dosage and treatment duration vary depending on the patient’s condition (kidney function, pregnancy status, and immune status), so follow the doctor’s prescription.
- Topical medications: Penciclovir cream and similar medications may provide some benefit when used early in the course of symptoms, but they are not as effective as oral medications.
- Immunocompromised, extensive, or severe cases: Hospitalization and intravenous acyclovir may be necessary.
- Suppressive (preventive) treatment
- If recurrences are frequent or there is a high occupational risk of transmission (for example, a high annual recurrence frequency or severe symptoms), a doctor may recommend long-term daily use of a low-dose oral antiviral (suppressive therapy).
- Symptomatic treatment and self-care
- Local hygiene: Keep the area clean without touching the blisters. Care is needed because ruptured areas are at risk of bacterial infection.
- Pain control: Relieve pain with analgesics (acetaminophen, NSAID).
- Sun protection: Using sunscreen for the lips may help prevent recurrences.
- Prohibitions/cautions: Do not use topical steroids without medical advice, as they may worsen the condition. Avoid activities that carry a risk of transmission, such as applying makeup and kissing or oral contact, until healing is complete.
- Complications and prognosis
- The condition is usually mild and self-limiting, but serious complications may occur in people with skin diseases such as atopic dermatitis, including widespread infection (eczema herpeticum), corneal involvement (herpetic keratitis), and, rarely, encephalitis (especially with HSV‑1). Severe localized or systemic infections may occur in immunocompromised people.
- Typical course: Improvement within 1–2 weeks. Because the recurrence rate is high, many patients experience repeated symptoms.
Checklist Before an Outpatient Visit (Including Items to Bring and Sample Questions)
- Items/information to bring
- The date and time symptoms began and whether prodromal symptoms were present (tingling, burning, etc.).
- Photos of the affected area (photos taken early in the outbreak can help with diagnosis and follow-up).
- The frequency of previous herpes labialis outbreaks (how many times per year), as well as previously prescribed medications and their effectiveness.
- Current medications (especially immunosuppressants and any previous use of antivirals) and medication allergies (such as to acyclovir).
- Possibility of pregnancy (whether pregnant or breastfeeding), chronic diseases, and recent immune status (for example, HIV or cancer treatment).
- Whether fever, eye pain, or systemic symptoms are present (report them if present).
- Sample questions to prepare in advance for the doctor at the outpatient visit
- "What treatment do you recommend for my current symptoms? Should I start it immediately?"
- "If I am taking other medications (or have allergies), what alternatives are available?"
Examples of General Questions to Ask the Doctor
- What are the expected effects and possible side effects of this medication?
- When should antiviral treatment be started for the best effect?
- What lifestyle habits or preventive measures can reduce recurrences?
- If recurrences are frequent, is suppressive (long-term) therapy needed, and what are the criteria?
- Does the treatment approach change if I am pregnant or breastfeeding?
- It seems to be spreading to my eye or face. Do I need emergency treatment immediately?
Examples of Condition-Specific Questions
- Pregnancy-related: "I am currently pregnant. Are there any special precautions I should take because of the effects of herpes labialis on the fetus or the risk of transmission during delivery?"
- Recurrence and suppressive treatment: "I have frequent recurrences each year (for example, six or more). Would suppressive therapy help? When should I start it, and what dosage and side effects should I expect?"
- If eye involvement is suspected: "I have eye redness, pain, and changes in vision. Do I need to see an ophthalmologist as well?"
Caution: The information provided is general medical information. Specific diagnosis and treatment for an individual should be determined in consultation with the attending physician.