What Causes An Itchy Rash On The Legs And Body?

My mother is 83, after being given a medication for her heart she developed a very itchy rash that started on her legs and spread all over her body, she was then treated with steroids internally and cortisone cream externally. The rash on her legs was the worst and sores were breaking out. After the cortisone she had extremely painful, burning legs as well as the itching. The original medication that started the problem was ceased. She has since sort the help of a Naturopath who has helped stop the itching, but she has been left with the painful, weeping, pealing legs. She has lost several layers of skin, it is very painful for her to stand on her legs, as soon as the blood rushes to her her legs they become painful and very red. What can be done to repair her damaged legs? YYYY@YYYY