I can feel for you I was in an industrial accident and got a 12 " cut in my abdomen down to my muscle around my stomach.
The DR said it would abscess if they stitched it up.
I had to have hydrogen peroxide poured through it for the next 5 months so it healed from the inside out.
there is a big gash/ scar but no major problems afterwards.
Seek out a wound care specialist it made the difference in my case.