Not just your forehead. Your entire body temperature goes up when you have a fever, but people traditionally use a hand against the forehead to tell if someone is running hot.
Exuberent Amounts Of Body Heat is released from your head naturally so its probably amped as you get warmer.
this is the best answer... and no you dont lose the most heat from your head, its an urban legend :s
Because you head has a large surface area and a very rich blood supply.
Glad that I can help :)
Makes sense. o.e