Hi. I have an unexplained rash that is popping up in different areas starting on my neck, then right arm, face, chest, now top of thigh and in groin area. Doctor gave me heavy dose of Prednisone by injection, and a 12 day regimen. I have no explanation as nothing new in life in terms of diet, detergents, anything. Is this viral? It continues to pop up and has been doing so for 10 days. Original areas from the beginning are starting to fade...