Body And Scalp Rash That Has Increased In Severity Over

body and scalp rash that has increased in severity over the last month. Been to dermt. and on steroids, creams and anithistimines etc.....getting worse. Today low body temp 96.3 and starting to get large black bruises on body ( leg below and behind knee) rash now cover entire trunk, most of upper part of both legs and is starting around my neck...also covers full scalp and head feels tight on right side. Been eliminating many things to find cause, so far no luck