...in conjuction with muscle ache and tenderness in the same areas(13 yr old boy). The rash is now moving to other parts of his body. Hes been having headaches pretty regularly but they dont think the two are related. Docs did bloodwork. Everything major came back neg. They said its a viral rash. I would like to know your thoughts. His rash is not itchy, not blistering, not accompanied with fever. Just makes his severely fatigued and can hardly move without him being in severe pain.