At first glance, I had the ridiculous thought that Scuba had grown a fifth leg.
On further inspection, I realized it was just a piece of shed skin hanging off the base of his tail. Later I found him submerged in his water dish, soaking his thin skin so it would peel off more easily.
(Fun side note: While salamanders don't spontaneously grow new limbs, they can regenerate lost limbs! The folks at Snake Discovery documented this process with a salamander they found after it's leg was bitten off by a dog:
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