(HealthDay News) -- A cold sore is a painful sore that often forms on the lips or around the mouth. While a cold sore is caused by the herpes virus, many factors can act as triggers.
The American Academy of Dermatology says potential triggers include:
New Trial Shows Pfizer’s mRNA Flu Shot Beats Traditional Flu Vaccine
The Flu Vaccine Can Lower Your Risk Of Heart Attack And Stroke — Even If You Wind Up Infected
The Reason Why Many Older Americans Skip Seasonal Vaccines
52 Kids Have Died From Flu So Far This Season as Child Hospitalizations Rise
Flu-Linked Brain Swelling Is Rare in Kids, But It Can Be Fatal