Why is my lip swollen for no grounds?

Alright so within the past two hours a weird blister ish bubble item formed on my lip.
ooks like i got punched in the mouth, but nought happened to me today.

it was a normal sunshine and i ate normal food, the only thing that might enjoy caused this is me being around two cats, which im allergic to. Also , when i felt it coming on i loving of sucked on it and messed with it a little and that probably made it worse

im starting school on tuesday and i really want to know how to get rid of this/ what it is.

please help me!
Answers:     It's an allergic reaction. Try benadryl.
if it's itchy and when you itch it, it hurts really badly, it's probably a cold sore


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