A bloody nevus, or vascular nevus, is a lesion of the endothelial cells of blood vessels, and more factors can induce its formation. Blood nevus is a common name, clinically known as vascular nevus. Vascular nevus is mostly a lesion formed due to abnormal proliferation of vascular endothelial cells, mutation of somatic cells, and skin aging. In addition, excessive obesity, abuse of hormone drugs, use of hormone-containing cosmetics, taking hormone-containing health care products, etc., leading to high estrogen levels in the body, are likely to induce vascular nevus. Some vascular nevi can subside by themselves without any discomfort, and do not need to be treated. If the vascular nevus increases in size and affects the appearance, it can be diagnosed and treated in regular hospitals. In daily life, you should pay attention to light diet, strengthen exercise, avoid tension and anxiety, and ensure sleep.