Is there any way you could oost couple of good close up pictures of this wound, couple different views with good zoom where we can see more detail? Somehow I don't think it's an abscess from the history of it that you gave us. At least I have never seen and abscess lasting for a year. However, whatever it is, keeping it clean will be imperative now. Also soak daily and feed good diet to help the tort's body along in him trying to heal this wound. Personally I don't see an issue with putting a bandaid on the tort as long as the adhesive is on structures more solid then the fleshy soft paper thin skin of the neck which would make removing it a hazard of giving him a nasty skin tear. If you have any type of adhesive dressing that could be applied to the hard non-movable parts where tort is not likely to rub it off and eat it... I'd say to your Mom: "go for it"