deep frostbite

deep frostbite

Frostbite that extends to subcutaneous tissue and muscle, which is characterised by a reduction and eventual loss of sensation in the affected regions, accompanied by oedema and blood blisters. The overlying skin is yellow and waxy, and turns purple on rewarming.
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Deep frostbite injuries will normally demarcate clearly with dry necrosis of the devitalised tissue, allowing amputation at 6-12 weeks post injury.
3-6) Superficial frostbite affects skin and subcutaneous tissues, whereas deep frostbite injuries can also affect bone, joints, and tendons.
If the area freezes further, deep frostbite occurs.
Blisters will appear with deep frostbite, and skin may become cold, waxy, pale and hard.
Signs of deep frostbite injury include purplish-colored "wooden skin," or skin so stiff that you can almost knock on it.