King Snake skin problem help

[TheProgramer]

I own a Mexican Black king snake. He's around 2 1/2 years old, and I've owned him since he was 4-months old. He's been healthy since I've owned him and he's never had any problems.
Snake: imgur.com/a/7QimK

However he has shown something on his skin recently I've never seen before. Any idea what this is? Do I need to take him to the vet?
Skin 1: imgur.com/a/1YLGP
Skin 2: imgur.com/a/P1Rvj

Here is his tank (lamp heat at day, heating pad under tank at night)
Warm side (80), cool side (70), humidity (30) (temps slightly lower at night)
Tank: imgur.com/a/4nhTH