What causes painful ingrown toenail after the nail has been removed months later callus was removed but still sore how come?

Nerves: You had an ingrown toenail. This required surgical resection of the nail. You still have pain. It most likely is the nerve regrowth in the area. This will take time. You must take meticulous care of the toes from now on. You ate at risk to lose the nail completely if you get infection again.

Nail care: Ingrown toenails can be remedied through soaking your foot in warm water, removal of embedded debris from the nail borders, and applying an antibiotic ointment to temporarily soften the corners. One should always try to cut the nails strait across to avoid leaving an embedded nail spicule. If pain or redness continues get it looked at by a professional. You may need to have surgical removal again.