My 9 year old son hasbeen dealing with a " rash" of sorts for over a month now. Started with a bacterial infection in his left testicle and what they thought was a heat rash around his groin/leg area. He also had severely itchy knots o . his scalp. He was given antibiotics and it seemed to clear, knots remained. About 3 days later the rash came back and spread to his abdomen. By the time we got to his follow up he was scratching like crazy and the rash had spred everywhere, up his back and neck and he had blisters it seemed in between his fingers. They diagnosed him with eczema. None of the medications helped. I took him back whem the blisters enlarged and he was put on antibiotics and told it was scabies. Everyone in the hiuse was treated and retreated and the rash seemed to leave for the most part except on legs. Now he has blisters in between his fingers again. What is wrong with my son?