Hello, My Dad Is 94 And Is Experiencing Pain Tingling

hello, my dad is 94 and is experiencing pain tingling in legs and feet. he is not diabetic. he has low blood pressure and low heart rate.he only takes levothyroxine for an underactive thyroid. he went to a neuropathy clinic today and they gave him 3 Marcaine injections in each ankle. fluid started flowing out of the injection site, from his tissue only on left leg. what is marciane used for in this instance?