Red nevi are actually hemangiomas, which are caused by the proliferation of local blood vessels, mostly bright red or cherry-colored, with a hemispherical elevation, usually about 1-5 mm in diameter, and can fade when pressed by hand and recover when released. They are commonly found on the trunk and proximal extremities, mostly in elderly patients. It may gradually increase with age and is a normal physiological phenomenon. It does not cause clinical harm, is not contagious, and is not cancerous, and therefore does not require clinical care. Blood nevus, also known as spider nevus, is caused by the continuous expansion of local capillaries in the epidermis or mucosa. It can be either red, brown or cyanotic and does not fade when pressed. It can occur on the face, neck, forehead and back and is mainly caused by an increase in estrogen in the body. It can be seen in patients with chronic hepatitis and cirrhosis, as well as in patients with rheumatism, rheumatoid arthritis, and Cushing’s syndrome. A small number of normal people may also see spider nevi, such as children, young women, and especially pregnant women.