Lobular hemorrhage under the finger and toenail is one of the signs of infective endocarditis. Infective endocarditis (IE) is an inflammation of the inner lining of the heart valves or ventricular walls caused by direct infection with microorganisms. So, what are the preventive methods for subungual lobe bleeding of finger and toe nails? The following is a brief introduction: 1. Patients with susceptibility factors should be given measures to prevent infection when doing surgery or operations; (1) For oral and upper respiratory tract operations or surgery, antibiotics against Streptococcus griseus should be given. (2) For urological, reproductive and digestive system surgery or operation, antibiotics should be given against enterococci. 2, early application; 3, the dose should be sufficient; the course of treatment should be long; choose bactericidal antibiotics; 4, intravenous administration is the main; 5, when the pathogenic microorganism is unknown, the acute use of a broad-spectrum antibiotic treatment for Staphylococcus aureus, Streptococcus and gram-negative bacilli are effective; subacute use of antibiotics for most streptococci, including enterococci; 6, when the pathogen has been isolated, should be based on the pathogenic When the pathogen has been isolated, antibiotics should be selected according to the degree of sensitivity of the microorganism to the drug; the minimum inhibitory and bactericidal concentrations of several antibiotics should be determined as the basis for the selection of antibiotics; 7, the combination of drugs can play a synergistic bactericidal effect to obtain a more effective therapeutic effect.