Hi all, I got my first vulcanite pipe just less than a month ago and I have been religiously cleaning and applying Obsidian oil after each smoke. Yet, my stem is starting to develop these marks:

What is that exactly? And is this just part of how vulcanite stems behave?
I am no clencher.
Thanks for your help and advice!

What is that exactly? And is this just part of how vulcanite stems behave?
I am no clencher.
Thanks for your help and advice!
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