My 4 guage conches had closed up to about 10 guage while I was in Iraq, so I had them repunched at 0 and stretched to 00. In order to get them to heal, I have dropped them down to 2 guage a couple times and stretched it back to 0, which sucks. You should try it some time and see why.
This is my cartilage. The toothpick is through the 10 guage holes, and all that flesh is what caused the excessive bleeding. I was told that the pressure from the stretching is what stops the bleeding, but decided that the pressure is also what causes the horrid discomfort, so I had Georg punch them with a zero. After all, everybody stops bleeding eventually.