The healing time of blisters on the feet varies according to the presence or absence of infection, as follows: 1. If there is no infection or secondary damage to the blisters, most of them will heal on their own within a week; 2. Some blisters are accompanied by breakage or secondary infection after grinding out the damage, and need to be treated promptly, otherwise they may take longer to heal. If the blisters rupture after grinding out blisters, there is a local vesicular surface, if secondary infection, there may be red, swollen, hot, painful reaction, some may delay 10 days, half a month or so before gradually healing, if not timely anti-infection treatment, the time may also be delayed longer. A blister on the foot needs to be actively treated regardless of how many days it takes to heal.