The extent of your upper lip swelling indicates a moderate to severe allergic reaction to something your mouth came in contact just a few hours before the swelling appeared. If you did not developed any difficulty in breathing or swelling of your tongue, you can take antihistamines every 4 hrs to control the swelling and the allergic reaction. If you have any of the symptoms associated call 911 or got to your nearest Emergency room.
These answers are for educational purposes and should not be relied upon as
a substitute for medical advice you may receive from your physician. If you
have a medical emergency, please call 911. These answers do not constitute
or initiate a patient/doctor relationship.