What causes swelling in upper lip?
Patient: Good morning.  I woke up to some nasal congestion as I have been sick with a cold for over a week.  As my sinuses were clearing I noticed a tender "pop" or "snap" like feeling.  My upper lip, right side, is now swollen and numb, as if I have received a lidocaine injection for dental work.  Should I be concerened? Doctor: thanks for your query, i have gone through your question. the lip swelling could be secondary to the tooth or , take care.um infection resulting in pus formation causing cellulitis or it can be allergic reaction to some drug or food items. the local anesthesia effect will be there for 1 hour after injection during that that time lip will be numb and you will be feeling like its swollen but it will not be swollen. consult a oral physician to rule out these two. if im your treating doctor i would have prescribesd a course of antibiotics and analgesics along with a antihistamine. i hope my answer will help you