White sided Bull needs help

[Lasher]

Okay guys, I need your help. My White-sided Bull has developed a hard mass about 10 ventral scales from his anal duct. It seems to be about .75” in length and it is sold, not liquid or gel. My first thoughts are a fecal stone, although pressure seems not to affect it or break it up. He has had a history of vomiting, but has kept down his last 2 meals of appropriately sized rats. Husbandry should be fine, about 80 to 85 degrees ambient W/ a hot spot of around 90 to 93 degrees. Water is provided 24/7. Humidity is 70 to 80%. He is aprox 1.5 years old and around 4.5’. I am currently thinking that it is one of three things: Abscess, Fecal Stone, or Tumor. Thoughts?
My plan of action is:
1. 2 days of soaking in warm water (30 min per) supplemented W/ mineral oil as a laxative.
2. Attempt feeding and wait 3 days to see if he can pass the blockage.
3. Call vet. I am on vacation next week and will be able to take him to the vet.

Anyone else ever dealt with this or something like it? Please advise.