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Noun: fever blister
Usage: N. Amer (elsewhere: cold sore)
  1. Caused by herpes simplex virus type 1 (HSV-1)
    "She applied an ointment to the fever blister on her lip";
    - oral herpes, herpes labialis, cold sore

Derived forms: fever blisters

Type of: herpes simplex

Encyclopedia: Fever blister