Think you may have cold sores? Symptoms and treatments you need to know.

Cold Sores (Herpes Simplex Virus)

Cold sores are a common viral infection affecting thousands of people across Ontario every year. Cold sores are caused by the herpes simplex virus type 1 (HSV-1) and are easily spread through close contact such as kissing or sharing drinks, utensils, or lip products. Once infected, the virus remains in the body and can reactivate during periods of stress, illness, or fatigue. As a pharmacist, I regularly help patients manage cold sores and access timely treatment without needing a doctor’s visit.

Symptoms of Cold Sores

Common cold sore symptoms include:

• Tingling, itching, or burning around the lips or mouth

• Small, fluid-filled blisters on or near the lips

• Crusting or scabbing as the sore heals

• Pain, redness, or swelling in the affected area

• Mild fever or swollen lymph nodes in some cases

Cold sores usually heal within 7–14 days, but early treatment can significantly shorten the duration of symptoms.

Preventing Cold Sores

To help reduce cold sore outbreaks in Ontario:

• Avoid close contact during outbreaks, including kissing or sharing food and drinks

• Use lip balm with SPF, especially during outdoor activities or seasonal sun exposure

• Practice good hand hygiene and avoid touching active sores

• Manage triggers such as stress, illness, or lack of sleep

• Keep your immune system strong: Adequate sleep, hydration, and a balanced diet can support immune health and reduce outbreaks.

Treatment of Cold Sores in Ontario

If you develop a cold sore, early treatment is important to shorten healing time and reduce symptoms. If you’ve had cold sores in the past and feel one coming on, contact a pharmacist through RxToday.ca to speak with a pharmacist for a virtual assessment and prescription.

Always remember: Cold sores are caused by a virus, so antibiotics are not effective. Take antiviral medication exactly as prescribed to reduce symptoms, speed healing, and lower the risk of spreading the virus.

If you think you may have a cold sore and have a valid OHIP card, fill out the form on RxToday.ca and speak to a pharmacist for an OHIP covered virtual assessment.

*Prescription will be written at the discretion of the pharmacist and is based on their assessment