What would cause this?

[snakemama]

He is adorable, just be careful in the sun. Kudos to your brother and his girlfriend for saving him.

ACK! It didn't even occur ot me that he might get sunburned!! I'll pass this along ASAP iwth the other information!!

[snakemama]

Quick update: When he was first found the vet did check his thyroid and a general senior panel which checks kindey/liver function among other things, and everything came back within normal ranges. He doesn't have any lesions on the skin or anything, so I think post shave alopecia is correct. I ordered a ShedEnder to help card out some of the old fur, and I'll keep everyone posted.