Title is pretty clear.

I visited a dermatologist who couldn’t diagnose it because it didn’t stay on my face long enough for them to check it clearly.. ?? Kind of weird. But whenever I get out of the shower or I get a little too warm, my face breaks out in a little rash like this for a few hours.

Has this happened to anyone or is anyone experiencing the same thing?

Edit: I don’t use anything on my face other than Dove soap. Not even any makeup