Thanks for aksing the query,
Swelling in the upper lip can be due to many reasons few are infection, lip biting, allergy, insect biting.
I thorough clinical examination by the Dentist
Apply local anesthetic
cream topically over the affected area.
Take lukewarm saline rinses.
Avoid eating of hot and spicy foodstuffs.
Avoid smoking and consumption of alcohol.
Start with the course of multivitamin
Hope you get wel soon.