How does packing a wound help it to heal?

I had a tummy tuck 3 weeks ago and I still have 1 spot (about 1/4 in. dia) that is not healed. After packing it (as I was instructed by my Dr.)for several days it has now grown to 1/2 in. in dia. How does packing help it to heal? Why doesn't the Dr. just re-stitch or steri-strip the hole to close it up? Packing is disgusting and how can stuffing the hole full of gauze possibly help? How long will I have this hole and will it keep getting bigger?

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