About 18 months ago I had surgery to deal with breast fibromatosis. The condition was benign, but it still led to a fairly brutal op. Following that I developed a significant haematoma which decided to drain all by itself. Imagine something like a scene from CSI as I stood in the shower with blood cascading down my body. OK. Don't!
Bottom line is that was managed to heal from the depth of the wound, to the surface. I didn't have to have my wound packed, as it was filled with congealed blood, which used to free itself up in egg-sized clots. Nice. OK. Not nice, and probably TMI.
Anyway, such an open wound inevitably became mildly infected, despite very careful management and an HbA1c of 31, so I had a couple of courses of antibiotics along the way. I am actually what my surgery calls a super healer, in that I heal very quickly, irrespective of my diabetes diagnosis.
The bottom line is that once the wound really got healing, one of my delightful tasks was keeping it open, to ensure there was no potential for a sealed pocket forming. Under no circumstances was I allowed to let the edges join together, so in the shower every morning, I had to check it was open, and if (after several weeks) it wasn't, I had to part the skin. Ooooh. That was a joyous 2-3 months.
So, maybe your challenge is as much about keeping your wound open until it is just no more, as I had to. It doesn't create a fine, thin scar, but it's not on view! Clearly, that's much easier when the dratted wound is on the front, as opposed to on the back. My poor old OH used to have to help me with my dressings in the early days, because of the wound site, significant swelling, and that it was still draining. The poor soul would be trying hard to do it, without looking.
At it's height I was seeing the ANP every couple of days, but as things subsided the visits became less frequent, although I would have been seen any day I felt I had an issue.
It's not a pleasant healing process. I don't envy you going back around the loop again. In your shoes, I want someone pretty specialised to be involved, because you don't need more and more scar tissue building up.
Really good luck with it all.