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(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:
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Robitussin Honey Cough Syrup Recalled Due to Fungal Threat
Antibiotics Probably Won't Ease Your Cough, Even If Infection is Bacterial: Study