I had the same problem with my black runner. We took him to the vet, first time put a stitch in his vent, gave us an antibiotic, told us to keep him separate from the flock. The stitch didn't work it fell back out, so we cut the stitch kept him in a crate by himself. I think in about a weeks time the end began to turn black, so back to the vets office for the dreaded snip! Too make a long story short
after a two month separation from the flock, all is back to normal for our runner. Good luck!

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