Mac mini hot to the touch. Is that a problem?

It seems to be running hotter lately. I'm not sure if it has an internal fan. It's about 3 years old.
Is this something to be concerned about?

Try blowing any dust for the internals. Install a temp monitoring program to see what the temperatures are. There are free ones in the Mac App Store.
What model Mini do you have?
How to identify Mac mini models

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