Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Are Cold Sores (Fever Blisters) Contagious?
Medically reviewed by Min Clinic Staff | Updated: January 2026
What is a cold sore (fever blister, HSV-1 HSV-2)?
- Cold sores are inflamed blisters in or near the mouth and lips.
- A herpes virus causes cold sores.