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Pain when the skin is cold itching when hot

Introduction
Cause
Examine
Diagnosis

Introduction

Introduction Frostbite is a localized inflammatory damage caused by cold. Frostbite is a common disease in winter, especially for children, women and the elderly. Once frostbite occurs, it is often difficult to cure quickly in the cold season. It will not heal until the weather turns warm. To reduce the occurrence of frostbite, the key is to prevent it before winter.

Cause

Cause

Cold is the most common cause of the disease, and factors that increase cold conduction and convection can contribute to the formation of the disease, such as humidity and wind speed. In addition, the decline of the body's ability to adapt to cold has also played an extremely important role in the formation of this disease.

An abnormal reaction of the body to the cold. Frostbite is a localized inflammatory lesion caused by cold during the winter or early spring. It occurs at the distal ends of the limbs and exposed areas such as the hands, feet, nose, ears, earlobes and cheeks. Modern medicine believes that frostbite is caused by poor cold tolerance of the skin of the patient, and cold invasion causes the skin of the distal skin to contract or sputum, leading to local blood circulation disorder, resulting in tissue damage caused by oxygen and nutrient deficiency. Chinese medicine believes that the occurrence of this disease is due to the lack of yang in the patient, the feeling of cold and dampness, making the blood run poorly, and the blood stasis is blocked.

As we all know, the hands and feet and the auricle are the distal part of the human blood circulation, and it is also a good site for 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. Therefore, the prevention of frostbite should be based on its pathogenesis, taking measures in advance, often with half the effort.

Examine

an examination

Related inspection

Blood routine lesion

According to its clinical manifestations and good times in winter, it is not difficult to make a diagnosis.

Diagnosis

Differential diagnosis

The disease should be differentiated from polymorphic erythema, the latter occurs in the spring and autumn, the lesion is pleomorphic, with typical iris-like damage, often accompanied by mucosal damage, occurs in the hands and feet.

1. Polymorphous erythema: also occurs in the back of the hand, fingertips, etc., but the damage is polymorphic, usually with 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. Acne 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, regardless of the season.