Lobular hemorrhage under the finger and toe nails is one of the signs of infective endocarditis. Infective endocarditis (IE) is a direct infection by microorganisms (bacteria, fungi and other microorganisms such as viruses, rickettsia, chlamydia, spirochetes, etc.) that produce inflammation of the endocardium of the heart valves or ventricular wall, including acute and subacute endocarditis. So, what are the causes of bleeding under the lobes of the finger or toe nail? The following is a brief description: 1. Lobular hemorrhage under the finger or toenail is usually caused by trauma, which is one of the signs of infective endocarditis, caused by direct infection with bacteria, fungi and other microorganisms (such as viruses, rickettsia, chlamydia, spirochetes, etc.) that produce inflammation of the heart valves or the endothelium of the ventricular wall causing the patient to develop lobular hemorrhage under the finger or toenail. 2, pathogens invade the bloodstream, causing bacteremia, sepsis or septicemia, and invade the endocardium, causing lobar hemorrhage under the finger or toenail. 3, The heart valve is abnormal, which is conducive to the residence and reproduction of pathogenic microorganisms.