The following is an introduction of spider nevus and pictures of spider nevus:

Spider nevus is an idiopathic telangiectasia, which is formed by the expansion of the terminal branches of cutaneous arterioles. The nevus body has a central point, and there are radial branches of small blood vessels around it, which look like spiders, so it is called spider nevus.

It is easy to occur in areas where superior vena cava is distributed, such as face, neck, upper chest, shoulders and upper limbs. It can be seen in patients with liver diseases such as cirrhosis and acute hepatitis, and also in healthy people, such as children and pregnant women.

Extended data:

The occurrence of spider nevus may be related to the increase of estrogen level. The estrogen in the blood of patients with chronic liver disease and some healthy pregnant women with obvious spider nevus is dozens of times higher than that of normal people.

When acute hepatitis, chronic hepatitis, liver cirrhosis and other diseases lead to liver function damage, the inactivation of estrogen by liver decreases, which leads to the increase of estrogen in blood, especially 17-β estradiol and estrone, which leads to the dilation of arterioles.

It can also be seen in rheumatism, rheumatoid arthritis and Cushing's syndrome. However, spider nevus on the skin is not always a disease signal, and about 1% ~ 15% of normal people can also have spider nevus.

For example, children aged 6-1 and young women, especially pregnant women, about 4% of healthy pregnant women have spider nevus. The cause of spider nevus in children may be caused by the increase of estrogen level in development stage.

Baidu Encyclopedia-Spider Nevus