Frozen fingers

Introduction Finger frostbite is a pre-symptom of frostbite. The hands, feet and auricle are the distal part of the human blood circulation and are the predilection sites of frostbite. After the late autumn, the temperature suddenly decreased and the blood flow in the peripheral blood vessels became slow. When the temperature is lower than 10 degrees Celsius, the subcutaneous arterioles in the above-mentioned parts are contracted by cold, and the venous return is not smooth, thereby causing frostbite. Some patients also induce frostbite due to congenital variability of blood vessels and narrow blood vessels leading to poor blood flow.

Cause

Cold causes skin vasoconstriction, local skin ischemia and hypoxia, and metabolic disorders. Long-term vasospasm dilatation, congestion, and plasma exudation cause local tissue edema, blister formation, tissue necrosis, and ulcer formation. Multiple symmetry occurs at the distal end of the extremities. It is common on the fingers, back of the hand, foot, heel, cheeks, auricles, etc., and can occur on one side. It occurs mostly in children and young women, and is more common in patients with poor blood supply in the extremities and sweating in the hands and feet.

an examination

Related inspection

blood test

Consciously itchy, burning, and swollen. Itching is aggravated by heat, and people with erosion or ulcers feel pain. Every year, the disease occurs in the winter, and after the warmth, it will heal itself and the course will be delayed. Multiple symmetry occurs at the distal end of the extremities. It is common on the fingers, back of the hand, foot, heel, cheeks, auricles, etc., and can occur on one side. It occurs mostly in children and young women, and is more common in patients with poor blood supply in the extremities and sweating in the hands and feet. These clinical manifestations can be used as a basis for diagnosis.

Differential diagnosis

1. Polymorphous erythema: It also occurs in the back of the hand, fingertips, etc., but the damage is pleomorphic. There are typical iridescent erythema, also known as target damage, purple in the middle, reddish edges, no congestion, After the acute, more common in the spring and autumn two seasons.

2. Nodular erythema: occurs in the calf extension, the inflammation is obvious, the pain is severe, no blisters and ulcers are formed, and it has nothing to do with the cold season.

3. Limb cyanosis: more common in adult women, two calves cyanosis, cold skin, micro-swollen, distal coloration, no ulceration, lack of self-conscious symptoms, symptoms all year round, not related to the season.

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