I hope he feels better soon.
I'm an RN and I can tell you that from a human standpoint (which I would guess would also be a canine standpoint) some wounds have to heal from the inside out. If a wound is deep, it needs to be...
more I can imagine though that it's a hard place to heal. I hope your Vet was able to help. Let us know how he's doing.
probably just stitch it back up especially since it sounds like the cyst popped, ouch.. Keep us in the loop, healing hugs to Moe and kisses to brother Ollie too! xo Love, Crystal and fam..