Wow, temperatures are definitely not "fine"! 117 degrees F is in the lethal range, he's gotta be at the least dehydrated and at the most going into heat exhaustion! As AHBD already told you, turn off his basking bulb immediately before he goes into heat stroke and dies. Seriously, way too hot. And his Cool Side Ambient temp being 90 is not fine either, it's way too hot. Not only is the Hot Side of his tank lethal, he has no Cool Side at all to go to, as he needs to always have! 80 degrees max in the cool side.
You cannot just blame these temperatures on "the house being too hot" and "again, the house", as that will not keep your dragon from dying. Anything from 110 to 115 degrees is dehydration and heat exhaustion temperatures, anything over 115 degrees is lethal range for a dragon. We had a dragon die a few months ago because the owner was using a stick-on thermometer only and had no idea what the basking spot temp was, and it was 123. He died a few hours after the person turned the basking bulb off. So you cannot be so lax about his temps, he's very uncomfortable right now at best, if not already sick.
And that's retained shed on his tail, as Venus already said they don't always shed the same parts at the same times, or the same parts each shed. So please just let it be, do NOT try to help him get it off, as that can result in a tail injury. It will come off soon enough.
Please do a better job of keeping his 3 temperature ranges at least close to where they are supposed to be, using either a temperature gun or a digital probe thermometer instead of a stick-on thermometer, if that's what you're using those temps could be even higher than that...Basking Spot Surface Temp between 105-110 degrees max, with 110 degrees the absolute maximum temp anywhere in his tank, Hot Side Ambient between 88-93 degrees max, and Cool Side Ambient between 75-80 degrees max, as he ALWAYS must have a place to go and cool down.