There are small red dots of blood nevus on the body is may be related to spider nevus, drug influence, hemangioma and other reasons. 1. Spider nevus: such as liver cirrhosis, liver cancer, etc., so that the liver function metabolism is abnormal, resulting in the decrease of the liver’s ability to inactivate estrogen, estrogen increases, appearing on the body long red small blood nevus situation. The small nevus looks like a spider and is called spider nevus. 2. Influence of medication: If estrogen is applied for a long time, it will affect the secretion and inactivation of estrogen, which will lead to the appearance of vascular naevus. Or long-term oral blood circulation and blood stasis drugs, the skin will also appear vascular nevus. 3. Hemangioma: it is mainly formed by capillary expansion, usually grows in the exposed parts of the limbs, often related to ultraviolet ray stimulation and friction stimulation. It belongs to a kind of common skin disease. It is recommended to go to the local regular dermatology department for diagnosis and treatment after clarifying the cause of the disease.