I am getting large blister under feet and it’s itching and painful. After a few weeks, it ooze out clear liquid and top skin becomes hard and black. Then the hard skin came out without any issue. But it takes almost a month to get cured without any treatment. Could not bear the itching. I met a skin specialist recently. She gave me ozx ointment. But it cures the blister. What should I do for permanent solution. And also I get small blisters around hand fingers and after some days it goes on it’s own.