Blood nevus actually refers to cherry hemangioma, also known as senile hemangioma, which mainly occurs on the trunk, extremities, face, etc. It usually appears as a red hemispherical papule with a bright red color ranging from the size of a grain of rice to a green bean. It may cause a small amount of bleeding after picking, and usually has no conscious symptoms, so clinically it does not need to be treated. Because there is no harm to the human body, treatment is not recommended, just observe. If some blood moles grow or scratch and become infected, it is a different story and anti-infective medication is needed.