Smiley Dental Waltham

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Fever Blisters Ulcers

Fever Blisters, Cold Sores, and Mouth Ulcers

What Is a Cold Sore?

A cold sore, also called a fever blister, is a cluster of painful blisters caused by the herpes simplex virus (HSV-1). Once infected, the virus remains dormant and reactivates during:
Cold sores are highly contagious, especially during blister and open sore stages.

Cold Sore Stages

When to Seek Emergency Dental Care

Call a dentist if:
Dentists may delay routine care until the blister is healed or scabbed.

Cold Sores vs. Canker Sores

Cold Sores (Fever Blisters)

Canker Sores (Ulcers)

Frequently Asked Questions

Are cold sores contagious?

Are cold sores contagious?

7–14 days.

Yes. Stress is the most common trigger.

No. Cold sores are viral; canker sores are not.

Antiviral creams, oral antivirals, cold compresses, lip sunscreen, hydration, and avoiding acidic foods.

Ready to restore comfort, function, and confidence?

Call Smiley Dental Waltham at 781-666-6000 to schedule your visit.