My Mexican Black King just shed last night. I looked him over this morning to make sure he looked okay and noticed what looked like part of one of his scales is missing. I immediately examined the shed and found the 'missing piece'. Just a few days prior to him turning blue I had noticed what looked like a piece of skin/shed on this scale. I thought perhaps this was another indicator that he was about to shed (although I'd not seen it before I knew he was due to shed soon so thought all was okay). Some time ago he got loose in my room for a few minutes (it was my fault but that's another story) and I wonder if the scale got caught as I was trying to retrieve him and possibly injured it?

I'm looking for any thoughts as to what this might be, why it happened and what I need to do to treat it. If needed I can post a pic.

Thank you in advance!