I have been tracking my m4 pro mini's temperature on both the die and the ssd and an external ssd, to get an impression of normal. I have to tell you 50 degrees C is not that hot. In usage spikes I see 66 degrees with just a few apps open. What I've observed is the machine's priority is to conserve energy, which includes how fast it spins the fan, which it prefers to let spin at idle 1000 rpm until it is really, really needed. Also be aware that under full load it will hover around 110 and under continued heavy use will reach 118 and peg itself there.
I've been using LLMs that fully load the GPU with work for long periods at a time, what's when I see 118, and the fans come up to full speed. I also have played several 3D games at 4K and 5K, when I see it then hover near 110 and engage the fans continuously at around 2500rpm.
My point is--this thing runs hotter than any Mac I've ever had--and it's also the fastest I've had by far. My only other M-series chips were M1 and M2 Air's that behaved entirely differently with regard to temperature.
Before you start saying something is *TOO* hot, you need to know what the engineering specs are for TJ Maximum, which is not published by Apple. You can also compare the temperatures we are seeing on M4 pros to other latest-generation silicon, which I have also learned runs far hotter than I am accustomed to.
Unless you are seeing performance throttling, I am willing to wager that your machine is operating normally. Or normal to Apple engineers, at least.