I have a recurring circular rash on my neck, chest and forearms. The spot on my neck is black and the spots on my chest and arms are red. I went to the minute clinic (given prednisone) and the rash dried up (dark spot remained) and the red spots went away. About 3 weeks later and the itchiness returned and the red spots returned in the exact same spots on my arms and chest. Went to my pcp, given an injection and prednisone again. Again the rash on my arms went away the the one on my neck dried and the black spot remained. Tonight....its happening again. The red spots are showing on my arms and my neck is itchy. My dr ruled out rickettsia and lyme disease and my blood revealed elevated mpv at 12.7. Any clue?