Red nevus in old age may be related to cherry angioma, spider nevus and other reasons. 1. Cherry hemangioma: also known as senile hemangioma, which is a benign skin lesion due to aging of local skin blood vessels and proliferation of capillaries, followed by expansion of the ends of these proliferated capillaries, which can gradually form cherry hemangioma. 2. Spider nevus: physiological factors such as increased secretion of estrogen and pathological factors such as cirrhosis, viral hepatitis and other liver dysfunction diseases lead to decreased inactivation of estrogen in the body, and under the action of estrogen, vascular networks radiating outward like spiders appear. It is recommended that elderly people with red nevi should go to regular hospitals in time to clarify the causes, and if treatment is needed, it should be standardized under the guidance of doctors.