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It does sound like a "wolf worm" or cuterebrae larvae. They commonly burrow a hole in the neck of cats. You need to carefully observe to see if there is a worm in the hole and you can put some small tweezers down in there to see if you can grab anything. If it is already burrowed out you won't find it and you can continue doing what you are doing with keeping it clean and the neosporin.
Let me know if you have more questions about this.
You need to put a warm compress on it for about 5 minutes and then remove the scab so that any infection can come out. If you see pus then you will need your vet to give your cat an antibiotic to take by mouth.