I'm thinking it's probably your skin.
skin
Your skin
Frostbite occurs in the feet first because the feet are the furthest from the heart.
Fingers, toes, any outward extremity will experience frostbite first, the last to see it would be areas closest to the heart.
Frostbite is the destruction of tissue due to exposure to very low temperatures.
Frostbite is not mold.
The essential steps for providing frostbite first aid are to gently warm the affected area, avoid rubbing or massaging it, and seek medical attention if severe symptoms persist.
The three stages are usually called frostnip, superficial frostbite, and deep frostbite. In stage 1 (frostnip), the skin reddens and then turns white. The area may feel numb. In the second stage of frostbite(superficial), the external layer of skin is frozen, but underneath is still soft. The area may appear grayish-yellow. In the final stage of frostbite(deep frostbite) the entire area is solid, and may appear grayish-blue.
Frostbite is freezing on the skin.
You can get frostbite if you live in the UK.
place the affected area in warm water
*Sighs* (Don't try this joke). Frost bite...?