question: MY HUSBAND IS 82 & HAS BEEN A JUVENILE DIABETIC SINCE HE WAS 20 YRS OLD. HE DID HAVE TOES AMPUTATED YEARS AGO. HE ONLY HAS 6% BLOOD SUPPLY TO HIS FEET. HE GOT A BLISTER ON THE TOP OF HIS FOOT THE SIZE OF A QUARTER. I WAS TOLD TO LET IT ALONE. TO DAY IT S THE SIZE OF A HALF A DOLLAR & ABOUT 3/4 INCHES HIGH. SHOULD I STERILE A NEEDLE & GENTLY PRICK IT. I WAS A REG. NURSE. CAN YOU HELP ME TILL I CAN GET AN APPT WITH THE DOCTOR?