Hellsgaurd and the nose. Genetic? or Not?

[odie]

I have been bothered recently after discovering that Curious Gorge did not have the Hellsguard signature nose. After doing some research or what little I could, I found that Curious Gorge's tribe had been shunned after a mess he had made. Originally, we had thought that the nose was genetic, possibly brought on from living in the volcanic region and breathing in the ash. But now, we are not so sure.

If its not genetic, then it would seem as though Curious Gorge was forced to remove it, or he removed it himself out of shame. If at all possible, could we have a hint or a solid answer as to where the hellsguard get their nose?