Why is face numb and swollen lips?

One possibility: Is an allergic reaction to something you've been exposed to. Please go to your do for an answer.

Multiple reasons....: One of the most common could be an allergic reaction, best to check with your doctor.

Swollen lips: Any airway swelling should be considered an emergency requiring immediate attention. A small allergic response today could be an acute allergic response next time. Don't shrug this off. Get evaluated immediately.

Need exam: There are many reasons for such a condition, and cannot be answered correctly unless a doctor reviews your medical history, see what area is numb, how much swelling you have, where the swelling seems to originate, etc. X-ray may be necessary to better diagnose. As a dentist, i see often that an infected tooth caused much swelling and abnormal nerve response. See a dentist/doctor today!