Swollen bottom lip

[concertmaster3]

Yesterday afternoon while eating at Subway, I noticed a small bump on the inside of the right side of my bottom lip.  It soon showed up on the outside of it, opposite where it was on the inside part.  Originally we thought it was just a cold sore, so I put some medicine for that on it and slept on it over night hoping it wouldn't get worse.  Now it looks like what is in the picture.  Any idea what it could be?

I haven't eaten anything out of the ordinary, unless the food at Subway had come into contact with something I am allergic to.  The only things that I knowingly am allergic to are lactose and chocolate, both of which cause me to purge.  Only that side of my lip is swollen, my tongue and throat feel fine.

Also, if it helps, I'm a musician (woodwinds and strings), and I haven't come into contact with any unusual instruments.  I've only played my flute, clarinets and violin this weekend.  

[concertmaster3]

I went to a primecare, and they ran some tests.  I just got the results back late Monday afternoon that it was just Herpes Type 1 (a cold sore).  There were 5 legions on the bottom of my lip (unseen in the picture because it's so swollen).  Thank you for the advice!

[Bhupinder Kaur, MD]

Hello,
Sudden swelling of the lip can be due to allergic reaction or angioedema. It can be due to food allergy in your case. Diagnosis is by clinical examination and complete blood tests, electrolytes and renal function tests. Treatment is by antihistaminics like Benadryl or Zyrtec and steroids. If the symptoms persist then please get it evaluated from a physician.

I hope it helps. Take care and regards.