Cover nose, ears, fingers and toes in the cold
Added
On very cold days, dress in loose layers and cover the body parts frostbite hits first: nose, ears, cheeks, chin, fingers and toes. Wear a hat, scarf or knit mask, mittens, and water-resistant coat and boots. If skin turns red or painful, get out of the cold or cover the area right away; numbness or white or grayish-yellow skin can mean frostbite is already starting.
The result
Result: CDC: frostbite usually affects extremities such as the nose, ears, cheeks, chin, fingers and toes; redness or pain means get out of the cold or protect exposed skin, and white or grayish-yellow skin or numbness can signal frostbite.
Source
CDC: Preventing Frostbite (opens the original source in a new tab). Check it for the latest numbers before you act.