Cause frostbite is the main cause of the cold, due to the cold of an injury resulting from the invasion of the body, generally occur in the hand, foot and finger (toe), nose and ear sites with poor blood circulation. Systemic frostbite can occur after shivering, limb fat cool, blue skin, body temperature gradually declined, feeling numb, mind blurred, slow, even into the coma, severe cases can lead to cardiac arrhythmias and shock and even death.
Under normal circumstances, a local disease is divided into three degrees of frostbite can be:
ⅰ: damage in the epidermal layers, skin irritation congestion, consciously hot, itchy or burning pain. Symptoms disappear in a few days later, do not scar left by.
Second degree: damaged dermal layer, except for irritation patients may have blisters or pain more severe, but insensitive, 1-2 day after scar can absorb water, forming crust, 2-3 weeks after healing, without leaving scars.
Third degree: damage up to the whole cortex, or in severe cases can be up to deep subcutaneous tissue, muscle, bone, or even entire limb necrosis. Skin became white, later become Brown, black, tissue necrosis. After the dead tissue falls off, leaving over long-term do not heal.
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