Hi, Welcome to Health care magic forum.
If the pain is still there,it appears that there might be unabsorbed sutures in side the lip, or may be there is mis appropriation of the tissues in the lip.
The other reason may be the
thrombus, in the lip.
I advise you to consult a plastic surgeon, for diagnosis.
You may need to have an M.R.I, for diagnosis, and should have a planned surgery, for correction.
Take more of green leafy vegetables, pulses, sprouts, and protein rich foods, to have good health, recovery, and resistance.
Wishing for a quick and complete recovery. Thank you.