What causes the blood mole on the body?

Blood nevus on the body is generally considered to be caused by local angiogenesis, and is related to adverse irritant factors such as long-term sun exposure and hot water scalding. It can also be considered to be caused by liver diseases, gallbladder polyps and other hepatobiliary diseases. You need to go to the hospital in time for vascular color Doppler ultrasound, hepatobiliary function and other examinations.