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Cold Sores
Mild
Cold sores are small, painful, fluid-filled blisters that usually develop on or around the lips and mouth. They are caused by herpes simplex virus and often recur after the initial infection because the virus remains inactive in nerve tissue. Outbreaks commonly heal within several days to a few weeks.
Body System
Skin Hair & Nails
When to Seek Medical Attention
Cold sores are usually not an emergency and often heal without complications. Seek medical assessment if lesions are unusually severe, extensive, persistent, frequently recurrent, or involve the eye. Prompt evaluation is important for eye pain, eye redness, light sensitivity, or vision changes.
Symptoms
2
Causes
2
Treatments
5
Diet
3
Overview
Cold sores are small, painful, fluid-filled blisters that usually develop on or around the lips and mouth. They are caused by herpes simplex virus and often recur after the initial infection because the virus remains inactive in nerve tissue. Outbreaks commonly heal within several days to a few weeks.
Symptoms 2
Eye Pain
Sudden Weakness
Causes 2
Cold sores are caused by herpes simplex virus, most commonly HSV-1. After the initial infection, the virus remains in the body in an inactive state within nerve cells and can reactivate later. Illness, fever, emotional stress, fatigue, sunlight, hormonal changes, or irritation around the mouth may trigger recurrent outbreaks. The virus spreads through direct contact with infected secretions or lesions.
Infection
Stress
Risk Factors
Cold sore outbreaks may be more likely during periods of physical or emotional stress, fever, illness, fatigue, or hormonal changes. Sun exposure and local irritation around the lips can also trigger recurrence. People with weakened immune systems may experience more frequent, severe, or persistent outbreaks.
Diagnosis
Diagnosis is based on a patient's medical history,
symptoms, physical examination and, when necessary,
laboratory or imaging investigations.
Cold sores are usually diagnosed clinically from their characteristic appearance and symptoms, particularly grouped fluid-filled blisters around the lips or mouth. A healthcare professional may examine the affected area and ask about previous episodes and possible triggers. A swab or laboratory test may be considered when the appearance is unusual or the diagnosis is uncertain.
Prevention
Key Prevention Tips
Avoiding direct contact with active cold sores and not sharing items that contact the mouth can reduce transmission
During an outbreak, avoid kissing and oral contact with others until lesions have healed
Identifying and reducing personal triggers such as excessive sun exposure or fatigue may reduce recurrences
People with frequent or severe outbreaks should discuss treatment options with a healthcare professional
Prevention Guidance
Avoiding direct contact with active cold sores and not sharing items that contact the mouth can reduce transmission. During an outbreak, avoid kissing and oral contact with others until lesions have healed. Identifying and reducing personal triggers such as excessive sun exposure or fatigue may reduce recurrences. People with frequent or severe outbreaks should discuss treatment options with a healthcare professional.
Reminder: Prevention recommendations should be tailored to your personal health status and risk factors.
Treatment & Management 5
Detailed treatment guidance is currently being prepared.
Detailed treatment guidance is currently being prepared.
Detailed treatment guidance is currently being prepared.
Detailed treatment guidance is currently being prepared.
Detailed treatment guidance is currently being prepared.
Medical Note: The treatment information provided is intended for educational purposes only.
Always consult a qualified healthcare professional before starting,
stopping, or changing any treatment.
Diet & Nutrition 3
Recommended Foods
Vitamin C Foods
Support immunity
Fresh Fruits
Rich in antioxidants
Water
Maintain hydration
Foods to Avoid
Alcohol
May trigger outbreaks
Processed Foods
Limit intake
Medical Nutrition Note: Diet recommendations are intended for general educational purposes and should be tailored to individual health needs by a qualified healthcare professional.
Frequently Asked Questions 5
Small painful blisters usually around the lips.
Usually herpes simplex virus type 1.
Yes, especially during active outbreaks.
Stress, illness, and sunlight exposure.
Yes, recurrent outbreaks are common.
Helpful Tip: These answers provide general medical information.
Consult your healthcare provider for advice tailored to your condition.