Well good news. After consulting a few more snake friends in the area that are extremely knowledgeable...I decided to wait until he shed before taking him to the vet.
The lump is gone, and he hasn't shed yet! Though he is about to any day!
This is great news. It may have just been a strange fat deposit that got used up. Either way, it wasn't there long. I'll still keep an eye on it but I feel relieved.