Hi Dear,
Welcome to HCM.
Understanding your concern.
Thanks for your query. The probable reason for bump on your lip is is
canker sore or cold sore . There can be many factors responsible for canker sore like stress (very common) ,irritation of mucosa due to food ,fruits and drinks,
vitamin deficiency and underlying diseases that weaken immune system.
They usually go away by their own without any treatment in week or two or by avoiding trigger factor .
I would suggest you to apply some antimicrobial ointment ,start
multivitamin supplement containing vitamin B12 and folic acid , quit smoking and drinking at least for some time and apply gel containing benzocaine for pain .
If condition persist after 2 weeks then
consult dentist for proper examination and to rule out causes like HIV , herpes or
oral cancer .
Hope your concern has been resolved.
Get Well Soon.
Best Wishes,
Dr. Harry Maheshwari