What Is a Cold Sore?
A cold sore is a small blister that usually appears on or around the lips. It’s caused by the herpes simplex virus (HSV-1), a very common virus that many people carry. Once you have the virus, it can “wake up” from time to time and cause new sores.
What Does a Cold Sore Feel Like?
Before the blister shows up, you may notice:
Tingling
Burning
Itching
Tenderness
Then a blister appears, may break open, crust over, and heal.
Common Triggers
Cold sores often flare up when the immune system is stressed. Common triggers include:
How Long Do They Last?
Most cold sores heal within 7–10 days.
Treatment Options
1. Antiviral Medications
These help shorten how long the sore lasts—especially if started early (within 24–48 hours of symptoms).
2. Comfort Measures
These can help reduce pain or irritation:
Cold compresses on the area
Petroleum jelly to keep the skin from cracking
Over-the-counter pain relievers (ibuprofen, acetaminophen)
3. Preventing Future Outbreaks
If you get cold sores often, your provider may suggest:
A daily antiviral medication
Using lip SPF in sunny weather
Managing stress and staying well-rested
