Yeah, shoulders can be bad 'uns... I took a chunk out of one of mine years ago, and it was much the same- can't fix it without doing more damage than it fixes. But they do tend to heal well at least... I hope it's not your wa... dominant hand 
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"We are the angry mob,
we read the papers every day
We like what we like, we hate what we hate
But we're oh so easily swayed"
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