cold sore
US /ˈkoʊld sɔːr/
UK /ˈkoʊld sɔːr/
1.
a small blister or group of blisters on the lips or around the mouth, caused by the herpes simplex virus
:
•
She woke up with a painful cold sore on her lip.
•
Applying an antiviral cream can help treat a cold sore.