Cold sore and I have a date tomorrow?

Anonymous
I've already cancelled on him twice because of a family issue and work. Last night a cold sore started to form. It's small. But I'd rather stay at home. Should I tell him I have one and would rather not go out? I don't want him to think I'm just making up excuses.
Updates
+1 y
It's not really the cold sore itself, my lip is pretty swollen. I'm trying to ice it down.
Cold sore and I have a date tomorrow?
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