There is no clear information on the chance of infection in small wounds after insulin injection and blood glucose monitoring. Many patients routinely wash their hands and disinfect the local skin before insulin injection or blood glucose monitoring, and there are generally few patients with wound infection in clinical practice, and most patients with infection are due to long-term non-replacement of insulin injection pens. It is recommended that the majority of patients can contact water after 5 to 10 minutes without bleeding after insulin injection or blood glucose monitoring.