Spider nevus pictures

Spider nevi picture, what is the spider

Spider nevus is a special kind of telangiectasia. It mostly appears on the face, neck and chest, but also on other parts. It is manifested as a small circular hemangioma with a diameter of less than 2mm in the center, with many capillaries extending around and branches, which looks like a red spider lying on the skin. If you press the center with a pencil tip, the spider nevus will disappear because the blood flow direction of the spider nevus is from the center to the surrounding capillary branches. If the center is compressed, the blood flow will be blocked and the spider nevus will disappear due to ischemia.

Introduction to the disease

Spider angioma: A vascular nevus formed by the branching and expansion of the ends of small arteries in the skin, resembling a spider, called spider angioma. Spider nevus is one of the more common capillary hemangioma in hemangioma.

The liver is an organ that regulates and inactivates the metabolism of human sex hormones, especially the estrogen secreted by the human sex organs, which must pass through the liver to weaken its function or make its activity disappear. When liver disease occurs, the ability to inactivate estrogen decreases, resulting in a large accumulation of estrogen in the body, causing the small arteries in the body to dilate.

Spider nevus is the result of the expansion of small arteries on the skin and mucous membranes, which appear to resemble spiders on the skin. The small ones are like pin caps, and the larger ones can reach more than 1cm in diameter. The center is slightly raised. If the pin cap is used to press the central erythema, the surrounding capillaries are thin. The blood vessels fade and recover after the pressure is removed. They usually appear in the areas where the superior vena cava is distributed, such as the hands, face and neck, anterior chest and shoulders.

Spider nevus is common in acute and chronic hepatitis or cirrhosis, and is also seen in pregnant women and healthy people. The incidence of spider nevus in patients with acute hepatitis is about 1%, while that of chronic hepatitis can reach about 54%. The appearance of spider nevus is often parallel to the state of liver function. When liver function deteriorates, spider nevus can increase rapidly; after liver function improves, the nevus may change from bright red to brown-black, and then disappear.

How do spider nevi form? Most scholars believe that it is related to estrogen metabolism. Adolescent girls and pregnant women will develop spider nevi due to the increase in estrogen content in their bodies. This is a normal manifestation. If a man or an elderly woman suddenly develops spider veins, you should be vigilant, because patients with liver cirrhosis, liver cancer, and chronic hepatitis accompanied by liver failure, due to the weakened ability of the liver to inactivate estrogen, the corresponding increase in estrogen content will also appear Spider mole. Therefore, some people say that spider nevi is a warning light for liver failure.

Spider mole itself is not harmful to the human body, but if spider moles are found, you should go to the hospital immediately to check liver function and liver B-ultrasound to rule out malignant tumors and various diseases that cause liver failure.

cause

Spider nevus is one of the common clinical signs of chronic liver disease, but the cause of spider nevus is not a type of liver disease. Here is an introduction to the cause of spider nevus, so that everyone can raise awareness.

The main cause of spider nevus is the disorder of sex hormone metabolism, and some scholars believe that the occurrence of spider nevus is directly related to the level of estrogen in the body. Therefore, clinically, spider nevus can occur in the following people:

1. Normal people: especially adolescent girls. Because adolescent girls are at the peak of growth and development, they have a lot of estrogen in their bodies, so spider moles can also appear, but this is a normal physiological phenomenon and does not require special treatment. The growth of estrogen, the secretion of estrogen gradually decreases, and spider moles will gradually disappear.

2. Pregnant women: spider moles are formed due to excessive production of estrogen, and women's body androgen will increase during pregnancy , so spider moles can also appear on the skin of some pregnant women , and most of them occur after pregnancy . -Within 5 months, but without special treatment, it can disappear on its own within a few months after delivery.

3. Patients with liver disease: The liver is an organ that regulates and inactivates human sex hormone metabolism, especially the estrogen secreted by human sex organs. It must pass through the liver to weaken its function or make its activity disappear. The inactivation ability of hormones declines, resulting in a large accumulation of estrogen in the body, causing the expansion of small arteries in the body to induce spider nevus in the body. Therefore, liver disease is a common cause of spider nevus, among which acute and chronic hepatitis or cirrhosis. Is the most common.

In addition, patients with rheumatoid arthritis, rheumatoid arthritis, and B vitamin deficiency can also develop spider veins.

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