Cold sores (herpes labialis)
Cold sores are small, fluid-filled blisters that appear on or around the lips, sometimes called fever blisters. They’re caused by the herpes simplex virus, which stays in the body for life and can reactivate from time to time — often after stress, illness, fatigue, hormonal changes, or strong sun exposure. Many people feel a tingle, itch, or burn a day before the blister shows up. Cold sores usually heal on their own in 1–2 weeks, but starting treatment at the first sign — ideally during that tingle stage — can speed healing and ease discomfort.
Self-care products available in our shop
- Docosanol cream (Abreva) — shortens healing when started early
- Numbing/soothing lip treatments for pain and itch
- Protective lip ointments (e.g., petrolatum) to stop cracking
- Lip sunscreen SPF 30+ to help prevent sun-triggered outbreaks
- Acetaminophen or ibuprofen for pain
Treatments our pharmacist can prescribe
For your information only: in Ontario, our pharmacist can assess this condition and, when appropriate, prescribe from the medications listed below. This information is provided for educational purposes — it is not an offer to sell. These are prescription treatments that require a pharmacist assessment, and the right option is chosen for you.
Antivirals: Acyclovir (Zovirax), Docosanol (Abreva), Famciclovir (Famvir), Valacyclovir (Valtrex)
Anti-inflammatory agents: Hydrocortisone
When to seek further care: See a health-care provider if the sore hasn’t healed after 14 days, looks infected (increasing redness, swelling, or pus), spreads, or comes with fever or swollen glands — or if you have a condition or medication affecting your immune system. If you get 6 or more cold sores a year, a pharmacist can discuss suppressive options.