Why can't you establish whether you are running a high temp. by touching your own forehead?

Question

Why can't you establish whether you are running a high temp. by touching your own forehead?

Answer 1

Because your hands will be warmer and not detect the temperature difference.

Answer 2

because your hands/wrists are the same temperature as your forehead.   the blood running through them is what gives them the high temperature.  therefore, it will be consistent throughout your entire body, making it harder to distinguish a temperature spike.

Answer 3

You might try using your wrist....our hands are use to washing dishes, and handling hot things so the temperature difference wouldn't be noticed.