My daughter gets these places on her feet, she is 24 years old. The are huge, on the bottom of her feet and look like blisters, but have no fluid in them, the skin will peel off and then become painful. She thought at first it was coming from a pair of boots that she has but it has happened when she did not wear them. They cover a huge area on her foot, mostly up by her toes. What do you think they could be? Thanks,