the first is retained shed.


The others look like to me that he's gotten into some tape and pulled the scales off, or maybe got oiled down and lost his scales.

They don't look like scale rot to me, but I've only seen the ulcerated pics online and the bubbling, fluid filled scales from when my snake Snoopy got a P. infection. Both of those events looked different from what you've posted.

Good luck!

R.