niiikk, with no information it is hard to even guess. Please post a screenshot of Ryzen Master (RM) and your specifications. You maximum temperature is 95C:
What is the Make & Model of your CPU Cooler?
Is it liquid or air CPU cooler?
Is the CPU cooler, it third party, list at AMD Recommended Ryzen Threadrippers CPU Coolers here: Thermal Solutions for Ryzen™ Threadripper™ Processors | AMD
Make sure it is installed correctly and making good contact with the CPU.
Once you answer the other questions plus your computer information might make it easier to determine your high temperatures.
It seems your Ryzen 5 2600 comes with the stock CPU Cooler Wraith stealth from AMD.
Make sure you use Ryzen Master to measure your CPU Temperature so as to be accurate in its reading.
Here is a review from TechPowerUp concerning the three AMD Wraith CPU Coolers: AMD Stock Coolers Tested: Wraith Prism vs. Wraith Spire vs. Wraith Stealth - TechSpot
From what I read, the Wraith Stealth is the least powerful CPU coolers of all the Wraith CPU Coolers. It is sufficient to maintain your Ryzen 2600 within it Max Operating Temperatures but does run hotter under heavy loads.
You can try and configure in your Motherboard's BIOS to run the fan at its maximum fan curve to get better cooling results as per this thread in Reddit: https://www.reddit.com/r/Amd/comments/67c0kb/help_wih_cooling_of_ryzen_5_1600/
I would suggest upgrading to a better 3rd party CPU Cooler from the list recommended by AMD that I linked in my first comment. Those are mainly Liquid CPU Cooler for more powerful Ryzen Threadrippers. But you should be able to find a cheaper "Air' Cpu cooler that is compatible with the Ryzen 2600.
The AMD Recommended lists at least three Air CPU Coolers. One from CoolerMaster and the other from Noctua and Arctic Freezer TR. Need to find out if it will fit in your computer case. There are probably others that maybe less powerful but stronger than the Stealth that you may be able to install.
I would google Ryzen 5 2600 Air CPU Coolers and see what products show up. Then you can find out which is the most compatible and fits your budget. Found this website that compares several AIR CPU Coolers models for the Ryzen 5 2600: https://www.windowscentral.com/best-amd-ryzen-5-2600-aftermarket-cooler . It from Dec. 2018.
EDIT: One factor could also be poor air circulation in the computer case. Remove one side panel and see if the temperature are lower then with the computer case sealed up. Also make sure your CPU Cooler is clean and the computer case vents are not clogged with dust.
Perhaps remove the case cover and see if temperature falls a lot - if so you know what to do!?
Normal is when CPU temp is a little higher ( ~5C) than room temperature when idel
~60C is quite normal for gaming - not sure where you got 88C from?
You can use GPU-Z which also monitors CPU temperature and it's fairly accurate too.
Here mine showing max temperatures recorded: