It's an almost pleasant warmth, and it's strange since I have no idea why it's like that. Skin at the area isn't itchy, red, swollen or painful. It's just very warm.

The sensation isn't constant, and it started happening a few days ago, ever since I had under 2 hours of sleep one night.

It usually happens around the edge of ears (mainly towards my earlobes), nostrils and eyelids, and less often my feet, which gets especially warm.