(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:
Tick Bites More Likely to Cause Red Meat Allergy Than Thought
Experimental Injection May Protect Against Peanut Allergy
A Good Spring Clean Can Help Tame Seasonal Allergies
