Fatty tail or?.....

[Albert Clark]

Ok. Are you controlling the heat with a thermostat? The reason I ask is so we can make sure the husbandry is correct. As far as the temps, do you use thermometers and hygrometers with probes or are you using the circular aneroid types? The snake is most certainly not gravid then since you have had him for a year. And also since he was a juvenile rules out that this is a ball python who is gravid. I don't know for sure if this could be a ball python who is in the stages of building follicles and hasn't been bred which would mean this is a female ball python. That may be a possibility. Do you feed live or f/t and do you monitor the feedings? This is important bc there has been cases of ball pythons swallowing paper towels along with their meal. Which could be a form of impaction. Long shot IMO. How long has the protrusion been evident to you?