Seroma with Hole After Abdominal Surgery?

I had open abdominal surgery about 3 weeks ago. I started to get drainage from the incision, followed by a seroma, which the doctor packed/took care of. Now I have another, but this one has a hole, maybe a bit bigger than a pencil eraser. Is this normal for a hole of that size to form? Will it close up on its own? Im really nervous about the healing process. I don't understand how the incision will be able to heal properly if there is a hole of that size. Any help would be greatly appreciated!