it kind of looks like a funky urate in a way but the pic is blurry and hard to tell.
I think the key here is that you handled the snake 24 hrs after feeding right? You should not handle for 48 hours...espcially if you gave it a bath or something. Either way...and I am by no mean super knowledgable.....I would probably wait the 2 weeks to feed again just in case it was a regurge. But that is just me and I am typically a paraniod mom.
By the way...I think Coolio Tiff was asking if you have a thermometer on your UTH...making sure it is controlling the UTH. Otherwise those UTH's can just get as hot as they want.
I think she understood that you have a temp gun on the way.
48 hrs is general rule but i hold many 24 hrs after at times no ill effect what so ever. Then again i feed smaller prey more often to keep them content rather full.
and your thinking of thermostat which controls heating, a thermometer only reads the heat.