Fractionated Coconut Oil is safe for use in the ear - however we do not recommend filling the entire ear canal with it. (animaleo.info)
The surgeon will remove the entire ear canal, which extends from the outer ear to the tympanic bulla. (vrc-nova.com)
These can be surgically debrided down with a CO2 laser, but they will return after a few years, or the entire ear canal can be removed in what is called a TECA, or total ear canal ablation. (allfelinehospital.com)