Dictionary

cold sore

noun

: a small sore area around or inside the mouth that is caused by a virus

Full Definition of COLD SORE

:  a group of fluid-filled blisters appearing about or within the mouth that are caused by a herpes simplex virus and upon rupturing form crusts —called also fever blister — compare canker sore

First Known Use of COLD SORE

1870

cold sore

noun    (Medical Dictionary)

Medical Definition of COLD SORE

:  a vesicular lesion that typically occurs in or around the mouth, that initially causes pain, burning, or itching before bursting and crusting over, and that is caused by a herpes simplex virus which remains dormant in the body and may be reactivated by a variety of factors (as stress, fever, or sunburn)—called also fever blister; compare canker sore

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