Sometimes referred to as fever blisters, they're caused by herpes simplex virus type 1 (HSV-1). Kids can get cold sores by kissing or sharing eating utensils with an infected person. Colds sores in the mouth are very common, and many kids get infected with HSV-1 during the preschool years.
Cold sores are common and usually clear up on their own within 10 days.. triggers your cold sores; use sunblock lip balm (SPF 15 or above) if sunshine is the trigger. you or your child also have swollen, painful gums and sores in the mouth .
Cold sores (also called fever blisters) are a common problem in children.. Closeup of mouth showing blister on lower lip. Cold. How are cold sores treated ?