I have a spot on my lip that won't go away.

Get spots checked: To answer this question fully a doctor would need to see the spot, know your age and history of sun exposure, and find out if the spot is painful, itchy, bleeding, discharging, growing, changing etc. Common causes of persistent spots on the lip include squamous cell skin cancers, so it is important to get this spot assessed by your dermatologist. It may require treatment or surgery.

Consultation: As the others have said someone needs to look at the spot to make a diagnosis, In some areas you may be able to do that virtually via this platform. In other areas you will unfortunately have to make an inperson consult with your doctor