What are the risk factors for spider nevus?
Although the causes of spider nevus are not fully understood, several factors put you at a higher risk: Age: The older you are, the more likely you are to get spider nevi. Aging may cause the valves in your blood vessels to weaken. Hormonal changes: Going through puberty, pregnancy, and menopause, as well as taking hormonal contraceptives, may lead to spider nevi. Sun exposure: Being in the sun, especially if you are fair-skinned, can cause spider nevi to form on your face. Family history: Weak vessel valves may run in families, so if members of your family have spider nevi, you are more likely to get them as well. Obesity: Excess weight can put pressure on your blood vessels. Sitting or standing for long periods of time: Being immobile can prevent the healthy circulation of blood.