Very wrinkly/loose skin horizontally along body...

[redshepherd]

I noticed Cake has been getting increasingly wrinkly horizontally along his body. Not vertically, like I often see in pre-shedding photos. I previously thought it was from getting ready to shed, but now I'm thinking otherwise... His skin feels almost loose and wrinkly horizontally, almost like it's falling down around his spine, and not rotund like my other BP is. It is particularly visible around his neck, with the skin hanging almost transparent below his neck?

He has a tup setup, a large water bowl, and his humidity is constantly around 70%~80%, depending on the day. The LA humidity lately has been around 60% in itself, so even with a ton of holes all over his tub (which now looks like swiss cheese), his humidity just is stuck at around that high. His feeding response is fine and he ate 4 days ago.

I'm hoping it is just from shedding, but just need to make sure... and any advice is appreciated! I can provide photos if needed.