I posted something similar a couple of years ago when I last experienced this.
I’ve got the sensation that the back of my thighs and buttocks seem hot. They’re not warm to the touch, but just feel hot, like the electric blanket has been left on. Sitting on the toilet seat feels like I’m sitting on a hot water bottle.
This has happened all of a sudden, as it did a couple of years back and it disappeared back then, all of a sudden.