# Instantaneous blister on my lip.  What could it be?

**URL:** <https://boards.straightdope.com/t/instantaneous-blister-on-my-lip-what-could-it-be/588645>\
**Category:** In My Humble Opinion\
**Created:** [July 11, 2011, 5:16pm UTC](https://boards.straightdope.com/t/instantaneous-blister-on-my-lip-what-could-it-be/588645 "2011-07-11T17:16:00Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Surly\_Chick](https://avatars.discourse-cdn.com/v4/letter/s/ec9cab/32.png) [@Surly\_Chick](https://boards.straightdope.com/u/Surly_Chick)\
**Post date:** [July 11, 2011, 5:16pm UTC](https://boards.straightdope.com/t/instantaneous-blister-on-my-lip-what-could-it-be/588645/1 "2011-07-11T17:16:00Z")

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In the last two minutes, I’ve developed a blister inside my lip. I’ve never had cold sores and I’m not allergic to any food that I know of. I also didn’t bite my lip. It doesn’t hurt but feels a bit numb.

I just ate some seafood salad off a salad bar. Perhaps I’ve been exposed to a biological agent of some sort deployed by terrorists trying to wipe out the population of New England?

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**Author:** ![SanVito](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/sanvito/32/2805_2.png) [@SanVito](https://boards.straightdope.com/u/SanVito)\
**Post date:** [July 11, 2011, 5:32pm UTC](https://boards.straightdope.com/t/instantaneous-blister-on-my-lip-what-could-it-be/588645/2 "2011-07-11T17:32:45Z")

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> [@Surly\_Chick](#):
>
> In the last two minutes, I’ve developed a blister inside my lip. I’ve never had cold sores and I’m not allergic to any food that I know of. I also didn’t bite my lip. It doesn’t hurt but feels a bit numb.
> 
> I just ate some seafood salad off a salad bar. Perhaps I’ve been exposed to a biological agent of some sort deployed by terrorists trying to wipe out the population of New England?

Either and insect bite or, more likely, a small allergic reaction to something . Lips are notoriously sensitive like that. Sit it out, take an antihistamine, and it will likely disappear as quickly as it arrived. I get it from raw cherries.

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**Author:** ![Omar\_Little](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/omar_little/32/269_2.png) [@Omar\_Little](https://boards.straightdope.com/u/Omar_Little)\
**Post date:** [July 11, 2011, 8:41pm UTC](https://boards.straightdope.com/t/instantaneous-blister-on-my-lip-what-could-it-be/588645/3 "2011-07-11T20:41:05Z")

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> [@Surly\_Chick](#):
>
> I’ve never had cold sores

Just because you’ve never had one, doesn’t mean you can’t catch herpes.

ETA: or you’re allegic to some sort of shellfish on the buffet.

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**Author:** ![AuntiePam](https://avatars.discourse-cdn.com/v4/letter/a/f19dbf/32.png) [@AuntiePam](https://boards.straightdope.com/u/AuntiePam)\
**Post date:** [July 11, 2011, 9:26pm UTC](https://boards.straightdope.com/t/instantaneous-blister-on-my-lip-what-could-it-be/588645/4 "2011-07-11T21:26:54Z")

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I’ve had those too. They usually disappear as quickly as they arrive. I don’t even notice when they’re gone.

It was probably the fake crabmeat. MSG or something.